This bug was fixed in the package gdm3 - 42.0-1ubuntu7.22.04.2

---------------
gdm3 (42.0-1ubuntu7.22.04.2) jammy; urgency=medium

  [ Daniel van Vugt ]
  * Add local-display-factory-Fix-typo-in-supported-session-types.patch:
    To fix unreliable session type selection (LP: #2006059)

 -- Sebastien Bacher <[email protected]>  Thu, 20 Apr 2023 15:27:53
+0200

** Changed in: gdm3 (Ubuntu Jammy)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/2006059

Title:
  systemd refuses to start secondary Xorg logins
  [[email protected]: Skipped due to 'exec-condition'.]

Status in gdm:
  Fix Released
Status in gdm3 package in Ubuntu:
  Fix Released
Status in gdm3 source package in Jammy:
  Fix Released
Status in gdm3 source package in Kinetic:
  Fix Released
Status in gdm3 source package in Lunar:
  Fix Released

Bug description:
  [ Impact ]

  Switching to a second user falls back to Wayland even when Xorg was
  explicitly selected.

  [ Test Plan ]

  On an NVIDIA DGX Station (known to reliably reproduce the issue):
  1. Start with a default Ubuntu 22.04 Desktop install
  2. apt install linux-modules-nvidia-525-server-generic 
nvidia-driver-525-server -y
  3. reboot (so new modules load)
  4. Login to a desktop session
  5. Create a new user using 'adduser'
  6. Attempt to "switch to" the new user from the existing login

  [ Where problems could occur ]

  Any part of the login procedure as that is what is being modified.

  [ Original Description ]

  I have three accounts and I need all three to run on xorg instead of
  wayland.

  For some reason, when switching accounts, two of them consistently
  start wayland even when I select plain gnome from the gdm menu. To get
  xorg, I need to log out and log in a second time.

  A solution that is supposed to work consists in customizing
  /etc/gdm3/custom.conf (see  https://docs.fedoraproject.org/en-
  US/quick-docs/configuring-xorg-as-default-gnome-session/). This
  solution does not work.

  I have also experimented with the following options:
  DefaultSession=gnome-xorg.desktop
  and
  PreferredDisplayServer=xorg
  Neither appears to set xorg as the default...

  I have found the following bug reported upstream against gdm:
  https://gitlab.gnome.org/GNOME/gdm/-/issues/733.
  It looks like this was fixed a year ago but my system is still affected.

  Note that I am using the gnome-session package. I doubt whether it
  makes any difference but I am adding it for the sake of completeness.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: gdm3 42.0-1ubuntu7
  ProcVersionSignature: Ubuntu 6.0.0-1010.10-oem 6.0.9
  Uname: Linux 6.0.0-1010-oem x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82.3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: GNOME
  Date: Sun Feb  5 19:44:53 2023
  InstallationDate: Installed on 2022-03-27 (315 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220326)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.gdm3.custom.conf: 2023-01-30T07:57:48.574915

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