This bug was fixed in the package gdm3 - 3.36.3-0ubuntu0.20.04.4
---------------
gdm3 (3.36.3-0ubuntu0.20.04.4) focal; urgency=medium
* debian/patches/ubuntu/reset-session-on-pam-error.patch:
- Backport upstream commit to fix ending up on a black screen when pam
session errors out. (LP: #1935818)
-- Didier Roche <[email protected]> Mon, 12 Jul 2021 11:44:23 +0200
** Changed in: gdm3 (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1935818
Title:
Black screen if PAM session fails to initialize completely
Status in gdm3 package in Ubuntu:
Fix Released
Status in gdm3 source package in Focal:
Fix Released
Bug description:
[Description]
If PAM session fails to initialize completely, the session aborts as expected
but GDM stays on VT1 and switches to a black screen. This is the case for
example, when requirement to start a session are not met and the session start
up has to be aborted.
[Test Plan]
1. In /etc/pam.d/gdm-password insert the line:
session requisite pam_deny.so
After the line
@include common-account
2. Login from GDM
3. Verify that:
- The session fails to start
- A black TTY is displayed
- Active TTY is 1
4. Apply the patched version
5. Login from GDM
6. Verify the login fails but GDM is still displayed and an error message in
printed under the password box.
[Where problem could occur]
* Cannot login at all with any user.
[Other info]
* Upstream bug report and patch:
https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/143
ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: gdm3 3.38.2.1-3ubuntu2
ProcVersionSignature: Ubuntu 5.11.0-20.21+21.10.1-generic 5.11.21
Uname: Linux 5.11.0-20-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu67
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Mon Jul 12 11:36:11 2021
InstallationDate: Installed on 2020-05-31 (407 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200527)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
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