[Bug 1882034] [NEW] cannot start X session with NIS account

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When login with a NIS account, X does not start, or more precisely it
starts and exits immediately.

Only errors in logs is:
 (EE) systemd-logind: failed to get session: PID 4335 does not belong to any known session

X11/gdm login works fine with local accounts.

SSH/terminal console login with NIS accounts works fine.

/etc/X11/Xwrapper.config:
  allowed_users=anybody

I've seen several reports of such problems under other versions (eg
19.10), but no working solutions was found. It seems that the problem is
the same with lightdm.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gdm3 3.34.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun  4 08:59:25 2020
InstallationDate: Installed on 2019-11-26 (190 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: gdm3
UpgradeStatus: Upgraded to focal on 2020-04-24 (40 days ago)

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


** Tags: amd64 apport-bug focal
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cannot start X session with NIS account
https://bugs.launchpad.net/bugs/1882034
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