Mainly it seems like the fix for bug 2119541 not working. But that fix
was trivial:

--- a/profiles/apparmor.d/abstractions/nss-systemd
+++ b/profiles/apparmor.d/abstractions/nss-systemd
@@ -25,6 +25,7 @@
   @{run}/systemd/userdb/io.systemd.Home rw,               # systemd-home dirs
   @{run}/systemd/userdb/io.systemd.NameServiceSwitch rw,  # UNIX/glibc NSS
   @{run}/systemd/userdb/io.systemd.Machine rw,            # systemd-machined
+  @{run}/systemd/userdb/org.gnome.DisplayManager rw,      # GDM implements a 
user database for its greeter

   @{PROC}/sys/kernel/random/boot_id r,

So please try:

  sudo systemctl reload apparmor.service
  sudo reboot

(although comment #16 suggests that was already tried) and make sure
this path exists:

  ls -l /run/systemd/userdb/org.gnome.DisplayManager

Finally, if you still have the bug then please tell us what you get from
this command:

  grep passwd /etc/nsswitch.conf

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https://bugs.launchpad.net/bugs/2121017

Title:
  Gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-
  greeter)]

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