Public bug reported:

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

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


** Tags: gdm3

** Package changed: puppet (Ubuntu) => gdm3 (Ubuntu)

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Desktop Bugs, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1881812

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

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