gdm3 not starting X or session manager
 

Hi, I have:

# uname -a
Linux adr-desktop 4.4.0-51-generic #72-Ubuntu SMP Thu Nov 24 18:29:54 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial
# ls -l /etc/alternatives/x-session-manager
lrwxrwxrwx 1 root root 19 Apr 27 2016 /etc/alternatives/x-session-manager -> /usr/bin/startxfce4
# ls -l /etc/alternatives/x-window-manager
lrwxrwxrwx 1 root root 16 Dec 5 01:33 /etc/alternatives/x-window-manager -> /usr/bin/openbox
# update-alternatives --list x-window-manager
/usr/bin/cinnamon-session-cinnamon
/usr/bin/cinnamon-session-cinnamon2d
/usr/bin/marco
/usr/bin/mutter
/usr/bin/openbox
/usr/bin/xfwm4

GDM3 is not working; luckily lightdm is working and I try to fix GDM3.

I do:
sudo systemctl stop lightdm
sudo dpkg-reconfigure gdm3
sudo systemctl start gdm
and I get nothing in .xsession-errors
When I access tty7 I get a blank black screen.
When I go to tty1 and write startx I get the XFCE fine working session.

What is the problem? :(

Here is the end of the log (/var/log/syslog, see the entire log attached):

Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input6/event3"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "Video Bus" (type: KEYBOARD, id 7)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_rules" "evdev"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_model" "pc105"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_layout" "us"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device Power Button (/dev/input/event0)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Power Button: Applying InputClass "evdev keyboard catchall"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got fd for /dev/input/event0 13:64 fd 16 paused 0
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) Using input driver 'evdev' for 'Power Button'
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Power Button: always reports core events
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: Power Button: Device: "/dev/input/event0"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Power Button: Vendor 0 Product 0x1
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Power Button: Found keys
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Power Button: Configuring as keyboard
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0/event0"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 8)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_rules" "evdev"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_model" "pc105"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_layout" "us"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device Sleep Button (/dev/input/event1)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Sleep Button: Applying InputClass "evdev keyboard catchall"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got fd for /dev/input/event1 13:65 fd 17 paused 0
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) Using input driver 'evdev' for 'Sleep Button'
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Sleep Button: always reports core events
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: Sleep Button: Device: "/dev/input/event1"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Sleep Button: Vendor 0 Product 0x3
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Sleep Button: Found keys
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Sleep Button: Configuring as keyboard
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input1/event1"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "Sleep Button" (type: KEYBOARD, id 9)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_rules" "evdev"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_model" "pc105"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_layout" "us"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HD Webcam C525 (/dev/input/event20)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) HD Webcam C525: Applying InputClass "evdev keyboard catchall"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got fd for /dev/input/event20 13:84 fd 18 paused 0
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) Using input driver 'evdev' for 'HD Webcam C525'
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) HD Webcam C525: always reports core events
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: HD Webcam C525: Device: "/dev/input/event20"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: HD Webcam C525: Vendor 0x46d Product 0x826
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: HD Webcam C525: Found keys
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: HD Webcam C525: Configuring as keyboard
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1.2/1-1.2:1.2/input/input23/event20"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "HD Webcam C525" (type: KEYBOARD, id 10)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_rules" "evdev"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_model" "pc105"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_layout" "us"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device Logitech USB Receiver (/dev/input/event4)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: Applying InputClass "evdev pointer catchall"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got fd for /dev/input/event4 13:68 fd 19 paused 0
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) Using input driver 'evdev' for 'Logitech USB Receiver'
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: always reports core events
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: Logitech USB Receiver: Device: "/dev/input/event4"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Vendor 0x46d Product 0xc52f
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found 20 mouse buttons
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found scroll wheel(s)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found relative axes
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found x and y relative axes
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: Configuring as mouse
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: Adding scrollwheel support
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: Logitech USB Receiver: YAxisMapping: buttons 4 and 5
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: Logitech USB Receiver: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:046D:C52F.0001/input/input7/event4"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "Logitech USB Receiver" (type: MOUSE, id 11)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: initialized for relative axes.
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: (accel) keeping acceleration scheme 1
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: (accel) acceleration profile 0
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: (accel) acceleration factor: 2.000
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: (accel) acceleration threshold: 4
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device Logitech USB Receiver (/dev/input/mouse0)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device Logitech USB Receiver (/dev/input/event5)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: Applying InputClass "evdev keyboard catchall"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got fd for /dev/input/event5 13:69 fd 20 paused 0
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) Using input driver 'evdev' for 'Logitech USB Receiver'
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: always reports core events
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: Logitech USB Receiver: Device: "/dev/input/event5"
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Vendor 0x46d Product 0xc52f
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found 1 mouse buttons
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found scroll wheel(s)
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found relative axes
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: Forcing relative x/y axes to exist.
Dec 6 13:27:18 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found absolute axes
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: Forcing absolute x/y axes to exist.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: Logitech USB Receiver: Found keys
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: Configuring as mouse
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: Configuring as keyboard
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: Adding scrollwheel support
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: Logitech USB Receiver: YAxisMapping: buttons 4 and 5
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: Logitech USB Receiver: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.1/0003:046D:C52F.0002/input/input8/event5"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "Logitech USB Receiver" (type: KEYBOARD, id 12)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_rules" "evdev"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_model" "pc105"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_layout" "us"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: Logitech USB Receiver: initialized for relative axes.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (WW) evdev: Logitech USB Receiver: ignoring absolute axes.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: (accel) keeping acceleration scheme 1
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: (accel) acceleration profile 0
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: (accel) acceleration factor: 2.000
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Logitech USB Receiver: (accel) acceleration threshold: 4
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device G15 Gaming Keyboard (/dev/input/event6)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) G15 Gaming Keyboard: Applying InputClass "evdev keyboard catchall"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got fd for /dev/input/event6 13:70 fd 21 paused 0
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) Using input driver 'evdev' for 'G15 Gaming Keyboard'
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) G15 Gaming Keyboard: always reports core events
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: G15 Gaming Keyboard: Device: "/dev/input/event6"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: G15 Gaming Keyboard: Vendor 0x46d Product 0xc226
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: G15 Gaming Keyboard: Found keys
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: G15 Gaming Keyboard: Configuring as keyboard
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.1/1-5.1.1/1-5.1.1:1.0/0003:046D:C226.0003/input/input9/event6"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "G15 Gaming Keyboard" (type: KEYBOARD, id 13)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_rules" "evdev"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_model" "pc105"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_layout" "us"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device G15 Gaming Keyboard (/dev/input/event7)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) G15 Gaming Keyboard: Applying InputClass "evdev keyboard catchall"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got fd for /dev/input/event7 13:71 fd 22 paused 0
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) Using input driver 'evdev' for 'G15 Gaming Keyboard'
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) G15 Gaming Keyboard: always reports core events
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: G15 Gaming Keyboard: Device: "/dev/input/event7"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: G15 Gaming Keyboard: Vendor 0x46d Product 0xc226
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: G15 Gaming Keyboard: Found keys
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: G15 Gaming Keyboard: Configuring as keyboard
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.1/1-5.1.1/1-5.1.1:1.1/0003:046D:C226.0004/input/input10/event7"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "G15 Gaming Keyboard" (type: KEYBOARD, id 14)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_rules" "evdev"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_model" "pc105"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_layout" "us"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH Front Mic (/dev/input/event9)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH Rear Mic (/dev/input/event10)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH Line (/dev/input/event11)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH Line Out Front (/dev/input/event12)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH Line Out Surround (/dev/input/event13)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH Line Out CLFE (/dev/input/event14)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH Line Out Side (/dev/input/event15)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH Front Headphone (/dev/input/event16)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH HDMI/DP,pcm=3 (/dev/input/event17)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH HDMI/DP,pcm=7 (/dev/input/event18)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device HDA Intel PCH HDMI/DP,pcm=8 (/dev/input/event19)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) No input driver specified, ignoring this device.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) This device may have been added with another device file.
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) config/udev: Adding input device G15 Extra Keys (/dev/input/event8)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) G15 Extra Keys: Applying InputClass "evdev keyboard catchall"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got fd for /dev/input/event8 13:72 fd 23 paused 0
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) Using input driver 'evdev' for 'G15 Extra Keys'
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) G15 Extra Keys: always reports core events
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) evdev: G15 Extra Keys: Device: "/dev/input/event8"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: G15 Extra Keys: Vendor 0 Product 0
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (--) evdev: G15 Extra Keys: Found keys
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) evdev: G15 Extra Keys: Configuring as keyboard
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "config_info" "udev:/sys/devices/virtual/input/input24/event8"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) XINPUT: Adding extended input device "G15 Extra Keys" (type: KEYBOARD, id 15)
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_rules" "evdev"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_model" "pc105"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (**) Option "xkb_layout" "us"
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: Activating service name='org.a11y.Bus'
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: Successfully activated service 'org.a11y.Bus'
Dec 6 13:27:19 adr-desktop org.a11y.Bus[11362]: Activating service name='org.a11y.atspi.Registry'
Dec 6 13:27:19 adr-desktop org.a11y.Bus[11362]: ** (process:11370): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Dec 6 13:27:19 adr-desktop org.a11y.Bus[11362]: Successfully activated service 'org.a11y.atspi.Registry'
Dec 6 13:27:19 adr-desktop org.a11y.atspi.Registry[11375]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: Activating service name='org.gnome.ScreenSaver'
Dec 6 13:27:19 adr-desktop org.gnome.ScreenSaver[11362]: ** (gnome-screensaver:11386): WARNING **: Couldn't get presence status: The name org.gnome.SessionManager was not provided by any .service files
Dec 6 13:27:19 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: Successfully activated service 'org.gnome.ScreenSaver'
Dec 6 13:27:19 adr-desktop gnome-session-binary[11365]: Entering running state
Dec 6 13:27:19 adr-desktop gnome-session[11365]: openConnection: connect: No such file or directory
Dec 6 13:27:19 adr-desktop gnome-session[11365]: cannot connect to brltty at :0
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) AIGLX: Suspending AIGLX clients for VT switch
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:72
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:68
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:67
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:70
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:66
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:84
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:69
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:64
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 226:0
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:71
Dec 6 13:27:23 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:65
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:72
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:68
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:67
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:70
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:66
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:84
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:69
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:64
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 226:0
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) AIGLX: Resuming AIGLX clients after VT switch
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) intel(0): switch to mode 1680x1050@60.0 on HDMI1 using pipe 0, position (0, 0), rotation normal, reflection none
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:71
Dec 6 13:27:46 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got resume for 13:65
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) AIGLX: Suspending AIGLX clients for VT switch
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:72
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:68
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:67
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:70
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:66
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:84
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:69
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:64
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 226:0
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:71
Dec 6 13:27:49 adr-desktop /usr/lib/gdm3/gdm-x-session[11354]: (II) systemd-logind: got pause for 13:65

This is pretty indicative that GDM tries to open a non-existing GNOME3 DE. Can you try to choose a different DE, xfce maybe?

@c0wb0y
I'm really glad it's easy to interpret the error (for me it's not).

I know how to change the properties below (with alternatives configurator):
/etc/alternatives/x-session-manager
/etc/alternatives/x-window-manager
/etc/alternatives/x-window-manager -> /usr/bin/openbox
update-alternatives --list x-window-manager

But how do I "choose a different DE"? consider the question in the context of my problem.
I know how to change the DE from the login page before logging but how do I do that when the login page it's a blank screen?

PS: DE it's xfce, gnome, kde, etc, right?

In GDM, disable automatic login so you can have a choice of DE (if you have few installed). I always try to install the most basic ones such as icewm, jwm when testing.
Or, if you can post a screen shot of your gdm "blank screen" so I can interpret better what you mean. Sorry, English is not my native language.

English is not my native language too :)
Blank screen means an empty/void screen/display - a completely black screen.
I have no mouse pointer, no keyboard input, no window, no buttons, nothing.
I have automatic login disabled anyway.

I have these DE:
ls -l /usr/share/xsessions/
-rw-r--r-- 1 root root 1.5K Feb 27 2016 LXDE.desktop
-rw-r--r-- 1 root root 157 Apr 11 2016 Lubuntu.desktop
-rw-r--r-- 1 root root 165 Apr 11 2016 Lubuntu-Netbook.desktop
-rw-r--r-- 1 root root 155 Feb 4 2016 cinnamon.desktop
-rw-r--r-- 1 root root 268 Feb 4 2016 cinnamon2d.desktop
-rw-r--r-- 1 root root 207 Aug 22 13:46 gnome.desktop -> it's working with lightdm
-rw-r--r-- 1 root root 138 Apr 15 2016 kodi.desktop
-rw-r--r-- 1 root root 6.8K Apr 11 2016 mate.desktop
-rw-r--r-- 1 root root 198 Oct 14 2015 openbox.desktop
-rw-r--r-- 1 root root 4.0K Oct 24 17:47 trinity.desktop
-rw-r--r-- 1 root root 204 Aug 22 13:47 ubuntu.desktop
-rw-r--r-- 1 root root 5.4K May 26 2015 xfce.desktop
-rw-r--r-- 1 root root 5.5K Jan 9 2016 xubuntu.desktop

cat /usr/share/xsessions/gnome.desktop
[Desktop Entry]
Name=GNOME
Comment=This session logs you into GNOME
Exec=gnome-session --session=gnome
TryExec=gnome-shell
Icon=
Type=Application
DesktopNames=GNOME
X-Ubuntu-Gettext-Domain=gnome-session-3.0

It seems to me I have indeed GNOME3, is it?

Additional information:
I have an Asrock N3150DC-ITX with Intel® Quad-Core Processor N3150.
I first installed Ubuntu 15.10 64x with an USB drive and later upgraded to 16.04 LTS and stayed with it.
The video drivers are from Ubuntu main repository, e.g.:
i965-va-driver:amd64 1.7.0-1 amd64 VAAPI driver for Intel G45 & HD Graphics family
libva-drm1:amd64 1.7.0-1 amd64 Video Acceleration (VA) API for Linux -- DRM runtime
and so on which seems to be 2016Q2 Intel Graphics Stack Release.

A complete DE includes a session manager. Quoting your post:

do you have any gnome-session manager installed which you can query by:

I am sure that is the missing piece.

dpkg -l gnome-session
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==================================-======================-======================-=========================================================================
ii gnome-session 3.18.1.2-1ubuntu1.16.0 all GNOME Session Manager - GNOME 3 session

apt-cache policy gnome-session
gnome-session:
Installed: 3.18.1.2-1ubuntu1.16.04.2
Candidate: 3.18.1.2-1ubuntu1.16.04.2
Version table:
*** 3.18.1.2-1ubuntu1.16.04.2 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages
100 /var/lib/dpkg/status
3.18.1.2-1ubuntu1 500
500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial/universe i386 Packages

which gnome-session
/usr/bin/gnome-session

update-alternatives --list x-session-manager
/opt/trinity/bin/starttde
/usr/bin/cinnamon-session
/usr/bin/gnome-session
/usr/bin/lxsession
/usr/bin/mate-session
/usr/bin/openbox-session
/usr/bin/startlxde
/usr/bin/startxfce4
/usr/bin/xfce4-session

It seems to me gnome-session is in good standing ...

gnome-session and other session managers are installed, that's good. Now, let us see who among them is the default session-manager. Can you issue this:

Change that to gnome-session, restart gdm3 then choose gnome3 DE. If it still fails, create a new user, then log in as that.

it's xfce, please review my first post.
I'll try with gnome-session soon.

Yeah, same problem: the login screen/window is just a black monitor.

When using:

ls -l /etc/alternatives/x-session-manager
lrwxrwxrwx 1 root root 22 Dec 10 14:20 /etc/alternatives/x-session-manager -> /usr/bin/gnome-session

with lightdm everything is fine; the login screen/window is visible and I can login - I can even choose GNOME as session and it works.

Hmm.... I'm also puzzled. 'spi' seems to be provided by at-spi2-core. Can you do:

and see if it is installed?

Then redo the restart dance.

dpkg -l | grep at-spi2-core
ii at-spi2-core 2.18.3-4ubuntu1 amd64 Assistive Technology Service Provider Interface (dbus core)

It seems a gdm issue. I tried it on my VirtualBox and it borked it :( . I did not bother to look into it.

I am running Debian unstable and after an upgrade and restart I was left with out a login screen, blank/black screen.

This bug helped me get it up and running again.

https://bugs.debian.org/cgi-bin/bugr...cgi?bug=847542

Well I found that besides gnome-desktop also exists ubuntu-gnome-desktop and ubuntu-gnome-default-settings which I haven't installed. After installing them gmd3 worked fine but Unity stopped to work both with gdm and lightdm. Anyway I found the problem.