Cannot select a session after a fresh installation - No selection is available in gdm

[Jean-Baptiste Lallement]

artful desktop 20170831

Test Case
1. Install latest artful desktop and proceed with the installation
2. Reboot to gdm
3. Select a user and click on the cog to select a session.
4. When the user logs in with the default selection it starts a wayland session

Expected result
There is a cog, when the user clicks on it, it shows a list of sessions available.

Actual result
the cog is not displayed and there is no way to select a session and the default session starts xorg.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubuntu-session 3.25.90-0ubuntu2
ProcVersionSignature: Ubuntu 4.12.0-11.12-generic 4.12.5
Uname: Linux 4.12.0-11-generic x86_64
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 31 11:07:08 2017
InstallationDate: Installed on 2017-08-31 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170831)
SourcePackage: gnome-session
UpgradeStatus: No upgrade log present (probably fresh install)

[Jean-Baptiste Lallement (jibel)]

output of logictrl --show-session

Id=3
User=1000
Name=ubuntu
Timestamp=Thu 2017-08-31 13:25:31 CEST
TimestampMonotonic=13783630
VTNr=2
Seat=seat0
TTY=/dev/tty2
Remote=no
Service=gdm-password
Scope=session-3.scope
Leader=1123
Audit=3
Type=x11
Class=user
Active=yes
State=active
IdleHint=no
IdleSinceHint=0
IdleSinceHintMonotonic=0
LockedHint=no

Session is ubuntu but type is x11

[Sebastien Bacher (seb128)]

Thank you for your bug report. It works here, from the description it looks like gdm might consider that wayland can't be used on your video driver and lists only x11 sessions as a result. Since you have one 1 session to list in that case it also explains why the cog has no list.

Could you enable gdm debugging in /etc/gdm3/custom.conf and see if the logs have any hint about that

[Jean-Baptiste Lallement (jibel)]

Indeed that's the issue. If I use another graphics driver (qxl instead of vga) then the 2 options are displayed. But then both entries start x11 (same than on my laptop)
I'm closing this report and will file another one for the other issue.

Thanks.