[Bug 1691357] [NEW] User switch not possible, login screen black

[Johon Doee]

Public bug reported:

The bug presents itself the following way:

It occurs with update to gdm3 3.24.1-0ubuntu0.1. Did not happen before,
downgrade to gdm3 3.24.0-0ubuntu2 solves the problem.

My session does auto-start. After the desktop is loaded I try to switch
to another user. The screen goes black for some seconds and switches
back to the primary user. No login screen or user chooser is visible.
After trying that one time, also logout is not possible anymore. After
logout I do not see the login greeter but a black screen instead.

Ubuntu Gome 17.04
Skylake 520

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: gdm3 3.24.1-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11
Uname: Linux 4.10.0-21-generic x86_64
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed May 17 08:28:01 2017
InstallationDate: Installed on 2016-04-21 (390 days ago)
InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Release amd64 (20160421)
SourcePackage: gdm3
UpgradeStatus: Upgraded to zesty on 2017-04-13 (33 days ago)
mtime.conffile..etc.gdm3.custom.conf: 2017-05-17T08:12:46.076209

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


** Tags: amd64 apport-bug zesty
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User switch not possible, login screen black

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[Johon Doee]

Also to add: It does not matter if the custom.conf file is standard or
with the modification I made (which is not really a modification
anyways).
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User switch not possible, login screen black

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[Jeremy Bicha]

I am setting the importance to Critical since this is a regression
introduced in a Ubuntu Stable Release Update according to #7 of
https://wiki.ubuntu.com/StableReleaseUpdates#Procedure

** Tags added: regression-update

** Changed in: gdm3 (Ubuntu)
Importance: Undecided => Critical
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[Jeremy Bicha]

Johon, the system journal excerpt attached to this bug has this line:
Mai 17 08:27:51 username-201604 gdm-autologin][3152]: gkr-pam: no password is available for user

And your GDM configuration has these lines:
AutomaticLoginEnable = true
AutomaticLogin = ubuntu

Is your username 'ubuntu'?
Does your user have a password?

** Changed in: gdm3 (Ubuntu)
Status: New => Incomplete
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[Johon Doee]

Jeremy, thank you for looking into this regression.

To answer your questions: Yes, my username is ubuntu, yes I do have a
password for that user.
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User switch not possible, login screen black

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[Jeremy Bicha]

Hmm, I enabled auto login and restarted after applying this update and I
still couldn't reproduce the issue. (I was able to log out and log back
in and switch to a different user).

What graphics driver are you using?
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[Johon Doee]

Hm, strange.

I use the standard intel graphics drivers that come with ubuntu. I did
not install anything else.

Maybe it's a problem of the users I have created?

I created 3 other users (see below with their respective UID).

ubuntu:1000
user1:1001
user2:999
user3:1002

Only ubuntu and user3 have passwords set. user1 and user2 do not appear
in the login screen (I removed both from login screen).

Anyways - could that be the problem? But if so - why did this does not
make problems with the former gdm3-version?
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[Johon Doee]

Any progress on that matter?
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[Launchpad Bug Tracker]

[Expired for gdm3 (Ubuntu) because there has been no activity for 60
days.]

** Changed in: gdm3 (Ubuntu)
Status: Incomplete => Expired
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[Brian Murray]

** Changed in: gdm3 (Ubuntu)
Status: Expired => New
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[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: gdm3 (Ubuntu)
Status: New => Confirmed
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User switch not possible, login screen black

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[EliotBlennerhassett]

** Bug watch added: Debian Bug tracker #874529
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=874529

** Also affects: gdm3 (Debian) via
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=874529
Importance: Unknown
Status: Unknown

** Bug watch added: GNOME Bug Tracker #780879
https://bugzilla.gnome.org/show_bug.cgi?id=780879

** Also affects: gdm via
https://bugzilla.gnome.org/show_bug.cgi?id=780879
Importance: Unknown
Status: Unknown
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User switch not possible, login screen black

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[Bug Watch Updater]

** Changed in: gdm
Status: Unknown => Fix Released

** Changed in: gdm
Importance: Unknown => Medium
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User switch not possible, login screen black

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[Bug Watch Updater]

** Changed in: gdm3 (Debian)
Status: Unknown => New
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User switch not possible, login screen black

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[Bug Watch Updater]

** Changed in: gdm3 (Debian)
Status: New => Confirmed
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User switch not possible, login screen black

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[Fred Vkigg]

I see this same behaviour on 2 machines with 18.04 when I have no swap.
With swap enable the problem goes away. Bug did not exist in 17.10 or I
believe until quite late in the 18.04 development cycle.
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