gdm can't open session for ldap users with usernames that begin with a number

[tylerecouture]

Description: Ubuntu 20.04 LTS

with ubuntu-desktop and libnss-ldapd

Trying to log in to the desktop environment when the username (e.g 9912345) begins with a number results in a black screen, and then quits back to the log in screen.

Here is the error:
`...gdm-password][5010]: pam_systemd(gdm-password:session): Failed to get user record: Invalid argument`

However, these users can log-in via ssh, and via TTY without issue.

This error does not occur if I log in with other users, without a number (e.g. test.user)

Also, the error does not occur if I switch to LightDM. With LightDM, a username such as 9912345 can login to the desktop desktop environment.

$ apt-cache policy gdm3
gdm3:
  Installed: 3.34.1-1ubuntu1
  Candidate: 3.34.1-1ubuntu1
  Version table:
 *** 3.34.1-1ubuntu1 500
        500 http://ca.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

[Sebastien Bacher (seb128)]

Thank you for your bug report, could you perhaps also report it upstream on

https://gitlab.gnome.org/GNOME/gdm/issues/ ?

[tylerecouture (tylerecouture)]

Done: https://gitlab.gnome.org/GNOME/gdm/-/issues/606

[tylerecouture (tylerecouture)]

related: https://gitlab.gnome.org/GNOME/gdm/-/issues/559

[tylerecouture (tylerecouture)]

FYI this appears to have been fixed in systemd: https://github.com/systemd/systemd/pull/15201

[Balint Reczey (rbalint)]

It is fixed in the systemd package since 245.4-4ubuntu1.