Sometimes cannot login to graphical environment.

On 18.04
gdm3 3.28.0-0ubuntu1
4.15.0-20-generic

I suspect it is related to gdm3, but not sure.
On freshly installed final release of bionic, I somtimes cannot login to gnome desktop. It is always preceeded by failed login attempt even though password is correct.

I can switch to a virtual console, but nothing happens when trying to switch back to graphical CTRL+ALT+F7 - stays in console.

It seems that sudo /etc/init.d/gdm3 restart might fix the problem, but I havn't tested extensively yet.

Note also that when the problem occurs there is no XDG_SESSION choices available on the login screen. The "settings" icon next to the login button is gone. After this an attempt to login with correct password will fail, and the second attempt to login with take me to the blank screen + cursor situation described above.

I can't say how to reproduce. On my machine it happens 50% of the times.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 27 16:14:51 2018
InstallationDate: Installed on 2018-04-26 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=da_DK.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2018-04-26 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Package: gdm3 3.28.0-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=da_DK.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Tags: bionic
Uname: Linux 4.15.0-20-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True