Public bug reported:

Premise: this is neither bug #1766137 (I've not  mispelled my passord)
nor bug #1844944 (sympthoms are exactly the same but the issue still
exists even if I'm running on Gnome 3.34.2 and the bug was closed saying
that the issue was fixed on Gnome 3.34.1).

Package version (apt-cache policy gdm3)
gdm3:
  Installed: 3.34.1-1ubuntu1
  Candidate: 3.34.1-1ubuntu1
  Version table:
 *** 3.34.1-1ubuntu1 500
        500 http://it.archive.ubuntu.com/ubuntu eoan/main amd64 Packages
        100 /var/lib/dpkg/status


Prerequisites:
- Use Ubuntu 19.10
- You need at least 2 users (e.g. user1 and user2)

Step to reproduce:
- Start your computer
- At the graphical login prompt, log in with user1: user1 is able to log in, 
its desktop is shown
- While logged into the desktop of user1, choose "Switch user"
- When back at the user selection screen, choose the profile of user2
- Provide the password for user2 and attempt log in

RESULT: 
The desktop of user2 is never shown. Instead, a purple screen is shown. If I 
click CTRL+ALT+F1 I go back to the tty1, select user 1, enter password and the 
user1's desktop is shown again.

NOTE 1:
The same happens when user2 was the first to log in after a reboot of the 
system. User2 is able to log in, and user1 is then stuck in a login loop.

NOTE 2:
If instead of switching user, I logoff user1 and logon user2 everything works 
properly but of course every time I do this I lose my user1's session 
(therefore the workaround is not good enough)

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gdm3 3.34.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-42.34-generic 5.3.18
Uname: Linux 5.3.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Mar 29 13:18:31 2020
InstallationDate: Installed on 2020-02-15 (42 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.custom.conf: 2020-03-28T11:16:16.647797

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan

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https://bugs.launchpad.net/bugs/1869574

Title:
  User switch doesn't work on Ubuntu 19.10

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