by no gnome means no desktop?
have you tried run dpkg command as @rubi1200 recommend?
$ sudo dpkg --configure -a
Sorry for delayâŠ
Yes rubi1200, as far as I can see now the major problem are those (there are some minor ones like Autokey hotkeys donât workâŠ)
For jipangmenjerit: that command has no effect at all (nothing happens!)
Thank you for help!
Here is what I would try next:
- Install LibreOffice
- Reinstall and restart gdm
sudo apt install libreoffice
sudo apt install --reinstall gdm3
sudo dpkg-reconfigure gdm3
sudo systemctl restart gdm3
Fingers crossed 
Done those commands:
after the first LibreOffice worked.
Troubles with the last 3:
I was asked which video manager use I clicked gdm then got a login screen but I could not login because a warning said that a session was already open and I had to logout first, that warning gave me the possibility to force the logout but clicking that nothing happened. Tried to shut off the laptop but no way, clicking on the power off button was likewise ineffective. I had to hard reset the system pushing the power-on button for 10 seconds.
Restarting it looks working, but at login there is not the possiility to choose Xorg or WaylandâŠ
Well, good that LibreOffice is working again.
Letâs try and fix gdm3.
sudo nano /etc/gdm3/custom.conf
You are looking for a line like this:
#WaylandEnable=false
If uncommented and says WaylandEnable=false, then Wayland is disabled.
To re-enable it, either:
-
comment it out again: #WaylandEnable=false
-
or change to WaylandEnable=true
Save the file with Ctrl+O >> Enter >> Ctrl+X
After that, we need to restart gdm from a tty terminal.
Stay in the session and type Ctrl+Alt+F3
Login with your username and password and then run this:
sudo systemctl restart gdm3
Then type Ctrl+Alt+F1 to get back to the login screen.
When you click your username you should now see the gear icon with the option to choose either Wayland or Xorg.
Done the âWaylandEnable=Trueâ (anyway âWaylandEnable=falseâ was commented)
after Ctrl+Alt+F3 at the comand sudo systemctl restart gdm3 I got the login screen as before but still no gear, no options on Xorg / Wayland)
Just a stupid suggestion, the gear only shows up when you click on the checkbox to enter your user name. I guess it doesnât show up when you do that, right?
Right, thatâs so. ThanksâŠ
What does this show?
lspci -nnk | grep -A3 VGA
If it shows nvidia that might be why Wayland is hidden.
Just in case, what does
dpkg -l | grep xserver-xorg-core
show?
$ lspci -nnk | grep -A3 VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07)
DeviceName: Onboard IGD
Subsystem: Dell UHD Graphics 620 [1028:07e6]
Kernel driver in use: i915
$ dpkg -l | grep xserver-xorg-core
ii xserver-xorg-core 2:21.1.12-1ubuntu1.4 amd64 Xorg X server - core server
Letâs check and see if the right sessions are running. We will hopefully get to the bottom of this 
ls /usr/share/wayland-sessions/
On a normal GNOME install you should see gnome.desktop
Also check this:
ls /usr/share/xsessions/
It should show this
gnome.desktop
gnome-xorg.desktop
If missing, it means we will need to try and reinstall gdm3.
$ ls /usr/share/wayland-sessions/
gnome-classic.desktop gnome-classic-wayland.desktop ubuntu.desktop ubuntu-wayland.desktop
ls /usr/share/xsessions/
gnome-classic.desktop gnome-classic-xorg.desktop ubuntu.desktop ubuntu-xorg.desktop
the word âclassicâ is attachedâŠ
echo $XDG_SESSION_TYPE
Does it show X11 or wayland?
If it shows wayland this is already the default and likely why you do not see the gear icon.
it shows waylandâŠ
Please post the entire output of this file, so we can make sure it really is correctly formatted:
cat /etc/gdm3/custom.conf
$ cat nano /etc/gdm3/custom.conf
cat: nano: No such file or directory
# GDM configuration storage
#
# See /usr/share/gdm/gdm.schemas for a list of available options.
[daemon]
# Uncomment the line below to force the login screen to use Xorg
WaylandEnable=true
# Enabling automatic login
# AutomaticLoginEnable = true
# AutomaticLogin = user1
# Enabling timed login
# TimedLoginEnable = true
# TimedLogin = user1
# TimedLoginDelay = 10
[security]
[xdmcp]
[chooser]
[debug]
# Uncomment the line below to turn on debugging
# More verbose logs
# Additionally lets the X server dump core if it crashes
#Enable=true
Next try:
sudo nano /etc/gdm3/custom.conf
#WaylandEnable=true just add the # before that line and then save.
Ctrl+O, Enter, Ctrl+X
Then systemctl reboot
Fingers crossed
Got the login screen as before, but with a small gear in the low right corner of the screen, it gives 4 options:
Gnome classic
Gnome classic on Xorg
Ubuntu
Ubuntu on Xorg