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I just upgraded to Ubuntu 20.04. But I'm now stuck with problems with display managers.

GDM3 (preferred DM for me) and xdm are just stuck at a black screen (with a blinking cursor/underscore).

Next idea was to start in recovery mode and try lightdm, which finally leads me to the login screen.

Just as I think my problems are gone and enter my login credentials at the login screen, the screen gets black and soon after that the login screen comes back. This keeps on happening for all desktop environment options except LXDE and Openbox.

I tried looking at answers provided for similar issues but they didn't work. Some had suggested

sudo apt remove chrome-remote-desktop

But I don't think it's installed in the first place for me as I get:

Unable to locate package chrome-remote-desktop

If someone could help me by giving out a few pointers, that'll be really helpful.

Averis007
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  • What is your video card, is it NVIDIA? If yes, try this – Raffa Feb 09 '21 at 11:48
  • What desktops do you have installed? You only mention one (LXDE) which you say works. – guiverc Feb 09 '21 at 11:50
  • This also is related and can help. – Raffa Feb 09 '21 at 12:02
  • @Raffa Yes my card is NVIDIA but I somehow doubt the linked solution will work. The reason being I didn't have any NVIDIA drivers installed initially, only nouveau driver. But then also, this problem was persisting. I have only recently installed an older (stable) NVIDIA driver (390) to get my resolution up. Earlier it was stuck at around 600X400 with nouveau. – Averis007 Feb 09 '21 at 12:03
  • @guiverc The other ones are GNOME Classic, Openbox, Ubuntu (Default) and Ubuntu on Wayland – Averis007 Feb 09 '21 at 12:06
  • @Raffa So for the second linked solution, the output to sudo systemctl status gdm is ● gdm.service - GNOME Display Manager Loaded: loaded (/lib/systemd/system/gdm.service; static; vendor preset: enabled) Active: inactive (dead) ubuntu-desktop was already installed to the latest version, I just reinstalled it as you had suggested. – Averis007 Feb 09 '21 at 12:08
  • Then the second linked solution is what you need. – Raffa Feb 09 '21 at 12:10
  • Let us continue this discussion in chat. – Averis007 Feb 09 '21 at 12:14
  • I would however give the first linked solution a shot if the second linked one didn't solve the problem. – Raffa Feb 09 '21 at 12:31
  • Unfortunately, none of the linked solutions worked. I have tried using kubuntu also. This is the crash report, if it can help. – Averis007 Feb 11 '21 at 08:42

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