Support GDM for switching users

[Christopher Barrington-Leigh]

When I choose to switch users from the the menu item with my name in it, under unity, with GDM installed (NOT lightDM) latest 12.04 update, the screen goes dark and locks under my original account. Instead, it should prompt me to log in as the other user.
I've tried rebooting, and the problem is repeatable.

Problem doesn't exist when LightDM is default.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.10.0-0ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
Date: Tue Apr 24 11:45:03 2012
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

Thank you for your bug report, is that specific to unity or does it happen in i.e GNOME session? What login manager do you use?

[Christopher Barrington-Leigh (cpbl)]

Oh, right. This is a clean install except that the original login manager wouldn't even let me log in, so I switched to gdm (I think).
That wasn't easy either..
 When I first login, I only have options "ubuntu" and "ubuntu 2d" , oh and recovery session and user-defined.

[Christopher Barrington-Leigh (cpbl)]

I think this confirms what I wrote: (?)

apt-cache policy gdm
gdm:
  Installed: 3.0.4-0ubuntu15
  Candidate: 3.0.4-0ubuntu15
  Version table:
 *** 3.0.4-0ubuntu15 0
        500 http://ca.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
        100 /var/lib/dpkg/status

[Christopher Barrington-Leigh (cpbl)]

... continued comment from above: I have gdm, not lightdm, installed:

apt-cache policy lightdm
lightdm:
  Installed: (none)
  Candidate: 1.2.1-0ubuntu1
  Version table:
     1.2.1-0ubuntu1 0
        500 http://ca.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
     1.1.9-0ubuntu1 0
        100 /var/lib/dpkg/status

[Sebastien Bacher (seb128)]

seems like an indicator-session,gdm issue, we recommend using lightdm though

[Christopher Barrington-Leigh (cpbl)]

Okay, so I reinstalled lightdm, which didn't used to even come up properly.
It does now.
Also, the problem in this bug report indeed does NOT occur under lightdm: I can switch between users.

So it only happens under gdm.

[Bilal Akhtar (bilalakhtar)]

This is because the switcher doesn't support GDM. Changing bug report accordingly.

[Árni Gunnarsson (arni1981)]

I'm using LightDM and similar things happen for me. When I choose "lock screen" and then log back in all is well. If I however choose to switch to another user and try to log myself back in Ubuntu freezes or "half freezes", the desktop becomes unusable.

This was not a problem with Beta2, but became a problem about a week ago probably for me. So I did a fresh install today with the final release and the problem was still there.

[Tanmay Gandhi (bitbyter-deactivatedaccount)]

Yes ... session indicator doesn't load aftrer using gdm,kdm and mdm.
But i think mdm supports multiple sessions.. ?
Is there another way of showing user name .. like about me etc.