Public bug reported:
I've performed an upgrade from Ubuntu 19.04 to 19.10 5 days ago by
running the command "sudo do-release-upgrade". The upgrade went well,
without errors. I've installed all updates to date (22 sept 2019). One
thing seems broken since the upgrade to 19.10: it is not possible to
switch users when using the Nouveau driver.
Prerequisites:
- Use Ubuntu 19.10
- You need at least 2 users (e.g. user1 and user2)
- The Nouveau drivers must be used
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, the lock screen is
shown. After pressing [Enter] to hide the lock screen, the login prompt
for user1 is displayed. On that screen, it is possible to press "Log in
as another user" and provide the password for user2 again. A login
attempt results again in the lock screen being displayed. it is never
possible to login in as user2.
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: this bug doesn't happen when the proprietary NVidia driver is
used (the version which can be installed via the Software & updates
screen, version 340.107).
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1844944
Title:
Ubuntu 19.10 switching users broken with Nouveau driver
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