It may be worthwhile to relate how you launch Xfce. Do you just "startx", or "startxfce4" or perhaps some DM like "kdm", "gdm" or "xdm" ?

@enorbet:

I'm using startx.
Thank you

At this point the only thing I can recommend is to login to runlevel 3 as root and then issue "kdm" to try to reduce the odds any gnome app will be invoked, which will bring you to a GUI login screen and from there with a Full Install you should be able to easily select several different WM/DEs even if momentarily before your PC heats up to see if any of them automount your external disks/sticks. For example if Fluxbox or KDE works then we can compare the logs to see what is different with Xfce. I know it's a bit of a pita but this is what I would try just to get some useful data.

Best wishes for good fortune to you.

@enorbet:

I'm not install the kde packages (only the xfce).

Thank you.

Oh. I thought you said this was a FULL RECOMMENDED Install?

@enorbet:

Yes, I said this that was a full recommended install. But I uncheck the kde packages (I only leave the xfce), and I uncheck too the TeX option and after install TeXLive with the slpkg.

Thanks

Could you post output with
Just checkin for missing xfce components

@ keefaz:

Here is the result:

bash-4.3$ ps -ef | grep [x]fce
rodrigo 1072 1054 0 feb26 ? 00:00:00 ck-launch-session dbus-launch --exit-with-session /usr/bin/startxfce4
rodrigo 1102 1072 0 feb26 ? 00:00:00 /bin/sh /etc/xdg/xfce4/xinitrc
rodrigo 1105 1 0 feb26 ? 00:00:00 dbus-launch --exit-with-session /usr/bin/startxfce4
rodrigo 1112 1102 0 feb26 ? 00:00:13 xfce4-session
rodrigo 1114 1 0 feb26 ? 00:00:00 /usr/lib/xfce4/xfconf/xfconfd
rodrigo 1123 1112 0 feb26 ? 00:01:06 xfce4-panel --display :0.0 --sm-client-id 221d207b1-dc37-4393-a23f-c8463bd23178
rodrigo 1156 1123 0 feb26 ? 00:00:00 /usr/lib/xfce4/panel/wrapper-1.0 /usr/lib/xfce4/panel/plugins/libwhiskermenu.so 21 16777254 whiskermenu Menú Whisker Mostrar un menú para acceder fácilmente a las aplicaciones instaladas
rodrigo 1173 1 0 feb26 ? 00:00:00 xfce4-power-manager --restart --sm-client-id 22f99722b-a8d6-42c7-bee4-05e557da10ff
rodrigo 1200 1123 0 feb26 ? 00:00:02 /usr/lib/xfce4/panel/wrapper-1.0 /usr/lib/xfce4/panel/plugins/liborageclock.so 14 16777256 xfce4-orageclock-plugin Panel de reloj Orage ¿Mostrar fecha y hora?
rodrigo 1201 1123 0 feb26 ? 00:00:01 /usr/lib/xfce4/panel/wrapper-1.0 /usr/lib/xfce4/panel/plugins/libsystray.so 6 16777257 systray Área de notificación Área dónde aparecen los iconos de notificación
rodrigo 1202 1123 0 feb26 ? 00:00:00 /usr/lib/xfce4/panel/wrapper-1.0 /usr/lib/xfce4/panel/plugins/libxfce4powermanager.so 12 16777258 power-manager-plugin Complemento de administración de energía Muestra los niveles de carga de batería de sus dispositivos y permite controlar el brillo de la pantalla.
rodrigo 1217 1123 0 feb26 ? 00:00:01 /usr/lib/xfce4/panel/wrapper-2.0 /usr/lib/xfce4/panel/plugins/libpulseaudio-plugin.so 2 16777262 pulseaudio PulseAudio Plugin Adjust the audio volume of the PulseAudio sound system
rodrigo 1227 1123 0 feb26 ? 00:00:11 /usr/libexec/xfce4/panel-plugins/xfce4-xkb-plugin 18 16777263 xkb-plugin Distribuciones de teclado Complemento de configuración y selección de distribuciones de teclado
rodrigo 1238 1123 0 feb26 ? 00:00:00 /usr/lib/xfce4/panel/wrapper-1.0 /usr/lib/xfce4/panel/plugins/libactions.so 16 16777264 actions Botones de acción Cerrar sesión, bloquear u otras acciones del sistema
rodrigo 1253 1 0 feb26 ? 00:00:00 xfce4-power-manager
rodrigo 19758 1 1 16:04 ? 00:00:00 /usr/bin/xfce4-terminal

That's no longer a Full Recommended Install if you uncheck things, ruy. Even though I came to Slackware just after v7 was released, when I and others tried to pare down so far as to get a kernel to fit on a floppy, these days I have adapted and am gladly aware that installing everything uses up nothing but hard drive space unless you run it/them. The advantage of installing everything is huge in Slackware for many reasons and the problems you are having might be some evidence of just that. FWIW on this box, my Main, my fully configured Xfce uses only about 12% - 18% fewer resources than my fully configured KDE depending on what's running at the time. I'm not touting KDE as a Desktop alternative for you but just trying to say that some of the libraries can be important or why would Xfce even bother to support KDE and/or Gnome? More importantly Patrick designed Slackware as an integrated base system. Not every component is essential but why wait to discover that through errors and faults when it could be so easily avoided?

At the very least had you installed a legitimate Full Recommended Install, you would have an additional set of tools to suss out the problem. For a few minutes install time and a tiny fraction of hdd space, you very likely could have avoided weeks of frustration and effort. I suggest you install what you checked off and see what new tools you get and the results they may afford you. It will also be worthwhile to see for yourself this will come at zero cost to your computing power when you use Xfce and very well may make it run better. FWIW I vastly prefer running the KWin compositor over Xfce's less capable alternative when running Xfce. It's cleaner, more powerful and does a much better job of eliminating screen tearing. Xfce has deep support of KDE and/or Gnome for good reasons. Discover this for yourself.

@enorbet:

Is true. But I read in the slackbuilds that the LaTeX installation (TeXLive in particular) could be some conflicts with the TeTeX installation, so I don't install the TeX package.
The first time that I install Slackware I nether check this options and it work fine (I mean the USB automount). So, the second time I install Slackware don't check this options.

Thank you

Thanks, I don't see anything obviously wrong
(ok maybe xfce4-power-manager --restart but it is not related to dbus, udisks or thunar)

There are two running instances of /usr/bin/startxfce4, same in my system (I don't know why it has to run twice)

Maybe you could redirect errors from x session in a file, and play with inserting and removing usb key in the hope an error will be triggered and an usefull error message will appear in log

Then in Xfce, in a terminal:
Open thunar and insert, remove usb key, see if there is something happening on terminal window

FWIW it is true that Tex is "small potatoes" not involved with fundamental operation but unchecking KDE is a huge change that could affect numerous operations as well as reduce the number and type of tools you have to work with..

@keefaz:

Here is the result of the file:

xauth: file /root/.serverauth.3434 does not exist


X.Org X Server 1.18.3
Release Date: 2016-04-04
X Protocol Version 11, Revision 0
Build Operating System: Slackware 14.2 Slackware Linux Project
Current Operating System: Linux slackware 4.4.115-smp #2 SMP Mon Feb 5 22:30:37 CST 2018 i686
Kernel command line: auto BOOT_IMAGE=Linux ro root=802 vt.default_utf8=0
Build Date: 18 October 2017 01:09:49PM

Current version of pixman: 0.34.0
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.1.log", Time: Thu Mar 1 22:08:31 2018
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
/usr/bin/startxfce4: X server already running on display :1
xfce4-session-Message: SSH authentication agent is already running
xfce4-session-Message: GPG agent is already running

(xfce4-session:3469): xfce4-session-WARNING **: xfsm_manager_load_session: Something wrong with /root/.cache/sessions/xfce4-session-slackware:1, Does it exist? Permissions issue?

** (polkit-gnome-authentication-agent-1:3490): WARNING **: Unable to register authentication agent: GDBus.Errorrg.freedesktop.PolicyKit1.Error.Failed: An authentication agent already exists for the given subject
Cannot register authentication agent: GDBus.Errorrg.freedesktop.PolicyKit1.Error.Failed: An authentication agent already exists for the given subject
No protocol specified
xscreensaver: 22:08:40: Can't open display: :1.0
xscreensaver: 22:08:40: initial effective uid/gid was root/shadow (0/43)
xscreensaver: 22:08:40: running as nobody/nogroup (99/99)

xscreensaver: 22:08:40: This is probably because you're logging in as root. You
shouldn't log in as root: you should log in as a normal user,
and then `su' as needed. If you insist on logging in as
root, you will have to turn off X's security features before
xscreensaver will work.

Please read the manual and FAQ for more information:

https://www.jwz.org/xscreensaver/faq.html
https://www.jwz.org/xscreensaver/man.html

#[35;01mwarning: hp-systray should not be run as root/superuser.#[0m

#[01mHP Linux Imaging and Printing System (ver. 3.16.5)#[0m
#[01mSystem Tray Status Service ver. 2.0#[0m

Copyright (c) 2001-15 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

#[31;01merror: hp-systray cannot be run as root. Exiting.#[0m
blueman-applet version 2.0.4 starting
Traceback (most recent call last):
File "/usr/bin/blueman-applet", line 121, in <module>
BluemanApplet()
File "/usr/bin/blueman-applet", line 63, in __init__
self.Plugins.Load()
File "/usr/lib/python2.7/site-packages/blueman/main/PluginManager.py", line 90, in Load
__import__(self.module_path.__name__ + ".%s" % plugin, None, None, [])
File "/usr/lib/python2.7/site-packages/blueman/plugins/applet/DBusService.py", line 12, in <module>
from blueman.main.applet.BluezAgent import AdapterAgent
File "/usr/lib/python2.7/site-packages/blueman/main/applet/BluezAgent.py", line 23, in <module>
from blueman.bluez.Agent import Agent, AgentMethod
File "/usr/lib/python2.7/site-packages/blueman/bluez/Agent.py", line 48, in <module>
class Agent(dbus.service.Object):
File "/usr/lib/python2.7/site-packages/blueman/bluez/Agent.py", line 56, in Agent
@AgentMethod
File "/usr/lib/python2.7/site-packages/blueman/bluez/Agent.py", line 38, in AgentMethod
if BlueZInterface.get_interface_version()[0] < 5:
File "/usr/lib/python2.7/site-packages/blueman/bluez/BlueZInterface.py", line 16, in get_interface_version
obj = dbus.SystemBus().get_object('org.bluez', '/')
File "/usr/lib/python2.7/site-packages/dbus/bus.py", line 241, in get_object
follow_name_owner_changes=follow_name_owner_changes)
File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 248, in __init__
self._named_service = conn.activate_name_owner(bus_name)
File "/usr/lib/python2.7/site-packages/dbus/bus.py", line 180, in activate_name_owner
self.start_service_by_name(bus_name)
File "/usr/lib/python2.7/site-packages/dbus/bus.py", line 278, in start_service_by_name
'su', (bus_name, flags)))
File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 651, in call_blocking
message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name org.bluez was not provided by any .service files
thunar-volman: No se admite el tipo de dispositivo USB «usb».
thunar-volman: No se admite el tipo de dispositivo USB «usb-storage».
thunar-volman: Dispositivo por tipo de bloque «disk» desconocido.
thunar-volman: No se pudo detectar el volumen en el dispositivo.

(xfce4-session:3469): Gtk-CRITICAL **: IA__gtk_widget_set_visible: assertion 'GTK_IS_WIDGET (widget)' failed
xinit: connection to X server lost

waiting for X server to shut down (II) Server terminated successfully (0). Closing log file.


Thank you and sorry for the delay in the answer.

@enorbet:

When I reinstall the OS, I'll install this package.

Thank you.

wait... you run X session as root user??