[SOLVED] apt-get update not working on newly installed Debian 10

pkexec still failed, even after successful install of nautilus-admin. See below for details. Any advice what to do next?

root@debian:/home/user# apt install nautilus-admin
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  gir1.2-nautilus-3.0 python-gi python-nautilus
Suggested packages:
  python-gi-cairo
The following NEW packages will be installed:
  gir1.2-nautilus-3.0 nautilus-admin python-gi python-nautilus
0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 284 kB of archives.
After this operation, 937 kB of additional disk space will be used.
Do you want to continue? [Y/n] 
Get:1 http://deb.debian.org/debian buster/main amd64 gir1.2-nautilus-3.0 amd64 3.30.5-2 [27.9 kB]
Get:2 http://deb.debian.org/debian buster/main amd64 python-gi amd64 3.30.4-1 [227 kB]
Get:3 http://deb.debian.org/debian buster/main amd64 python-nautilus amd64 1.2.2-2 [19.8 kB]
Get:4 http://deb.debian.org/debian buster/main amd64 nautilus-admin all 1.1.9-2 [10.1 kB]
Fetched 284 kB in 1s (221 kB/s)           
Selecting previously unselected package gir1.2-nautilus-3.0:amd64.
(Reading database ... 235160 files and directories currently installed.)
Preparing to unpack .../gir1.2-nautilus-3.0_3.30.5-2_amd64.deb ...
Unpacking gir1.2-nautilus-3.0:amd64 (3.30.5-2) ...
Selecting previously unselected package python-gi.
Preparing to unpack .../python-gi_3.30.4-1_amd64.deb ...
Unpacking python-gi (3.30.4-1) ...
Selecting previously unselected package python-nautilus.
Preparing to unpack .../python-nautilus_1.2.2-2_amd64.deb ...
Unpacking python-nautilus (1.2.2-2) ...
Selecting previously unselected package nautilus-admin.
Preparing to unpack .../nautilus-admin_1.1.9-2_all.deb ...
Unpacking nautilus-admin (1.1.9-2) ...
Setting up python-gi (3.30.4-1) ...
Setting up gir1.2-nautilus-3.0:amd64 (3.30.5-2) ...
Setting up python-nautilus (1.2.2-2) ...
Setting up nautilus-admin (1.1.9-2) ...
root@debian:/home/user# nautilus -q

** (nautilus:1903): WARNING **: 15:33:01.362: Error on getting connection: Failed to load SPARQL backend: The connection is closed

(nautilus:1903): GLib-GIO-CRITICAL **: 15:33:01.362: g_dbus_connection_signal_unsubscribe: assertion 'G_IS_DBUS_CONNECTION (connection)' failed

(nautilus:1903): GLib-GObject-CRITICAL **: 15:33:01.362: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

(nautilus:1903): GLib-GObject-CRITICAL **: 15:33:01.362: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
No protocol specified

(nautilus:1903): dbind-WARNING **: 15:33:01.497: Could not open X display
Traceback (most recent call last):
  File "/usr/share/nautilus-python/extensions/kdeconnect-share.py", line 72, in __init__
    None)
gi.repository.GLib.Error: g-io-error-quark: The connection is closed (18)

root@debian:/home/user# pkexec gedit
Unable to init server: Could not connect: Connection refused

(gedit:1952): Gtk-WARNING **: 15:36:14.191: cannot open display: 
root@debian:/home/user# cd /
root@debian:/# pkexec nautilus

** (nautilus:1957): WARNING **: 15:37:31.994: Error on getting connection: Failed to load SPARQL backend: Cannot autolaunch D-Bus without X11 $DISPLAY

(nautilus:1957): GLib-GIO-CRITICAL **: 15:37:31.995: g_dbus_connection_signal_unsubscribe: assertion 'G_IS_DBUS_CONNECTION (connection)' failed

(nautilus:1957): GLib-GObject-CRITICAL **: 15:37:31.995: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

(nautilus:1957): GLib-GObject-CRITICAL **: 15:37:31.995: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Unable to init server: Could not connect: Connection refused

(nautilus:1957): Gtk-WARNING **: 15:37:31.996: cannot open display: 

root@debian:/# pkexec gedit
Unable to init server: Could not connect: Connection refused

(gedit:1963): Gtk-WARNING **: 15:37:42.041: cannot open display:

After install of nautilus-admin it is not necessary to run this from the command line anymore. You'll get "Open as Administrator" and "Start as Administrator" menu entries in the right-click menu in the file manager:
https://4.bp.blogspot.com/-Bd7OJl2Xg...n-as-admin.png
https://3.bp.blogspot.com/-0RIXgsPVM...le-as-root.png

shruggy, that works like a charm. Thanks!!!

Just one more question. Whenever I hit Alt-F2 or Ctrl-Alt-F2 while using Debian, all that happens is that my sound volume is turned down to zero. Is this really supposed to open a text console? My computer starts up with Gnome but I also installed KDE, though I haven't tried KDE yet.

Is it a laptop? Most laptops and even some desktop keyboards have a Fn key. On some models you must press Fn+F2 to get the normal function of the F2 key. So try Fn+Ctrl+Alt+F2. Yes, it gets a bit unwieldy .

BTW, when I said Alt+F2 above I didn't mean changing to a virtual console. Alt+F2 inside GNOME/KDE/XFCE et al. invokes "Launch an application" prompt, akin to Win+R in Windows.

Many thanks again shruggy!

On my laptop, it was Alt-Fn-F2 that worked.