Purple screen after upgrading to Ubuntu 21.10

Couldn't log in because the gdm3 login screen has no password field, see screenshot:

The unability to switch from current session to the TTY3 text console (Ctrl+Alt+F4 or F3 didn't work here) forced me to restart in recovery mode in order to select lightdm instead of gdm3 using:

sudo dpkg-reconfigure lightdm

which did work fine.

I retried:

sudo dpkg-reconfigure gdm3

after having uninstalled gdm3 with:

sudo apt purge gdm3

and reinstalled with:

sudo apt install --reinstall -y gdm3

with no success. The same blank login screen is still there.

Any clue would be greatly appreciated.

P.S.: Error message on upgrade day (never seen before):
nov. 04 07:21:06 jhn gdm3[1738]: Gdm: Failed to list cached users: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.11 was not provided by any .service files

3 Sorted by: Reset to default

Purple screen after upgrading to Ubuntu 21.10

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