Public bug reported:
Today at the login screen whenever I entered my credentials it paused a
couple seconds and kicked me back to the login screen, seemingly
crashing. The logfiles directed me toward /tmp/.X11-unix whose
permissions were:
drwxr-xr-t gdm-greeter gdm 80 Jun 29 23:00 /tmp/.X11-unix
I performed these actions:
$ sudo trash /tmp/.X11-unix
$ sudo mkdir /tmp/.X11-unix
$ sudo chown root:root /tmp/.X11-unix
$ sudo chmod 1777 /tmp/.X11-unix
$ sudo systemctl restart gdm3
And it worked again, allowing me to login. Later in the day, my session
crashed and I was kicked into login and it seemed to fail again. I
rebooted and then it was definitely failing the same way. I used the
same trick to fix it.
Ideally would like a persistent fix and/or resolution of the underlying
problem.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: gdm3 50.0-0ubuntu1
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 29 23:16:23 2026
EcryptfsInUse: Yes
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2158684
Title:
Login crashes due to /tmp/.X11-unix permissions
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