[Bug 1059137] Re: Cannot login after un upgrade from 12.04 to 12.10 (ubuntu-2d)

[MikeCamel]

I've marked #964607 as a duplicate.  I believe that the problem lies in
/var/lib/AccountsService/users/<username> file.

I had this line:

XSession=xsession

I noticed that a new user had

XSession=ubuntu

I changed mine to read "ubuntu", rebooted, and was fine.

The original poster said "In my opinion, this fix should be applied
automatically for all users using ubuntu-2d and upgrading their
distribution."  I'd change this to "this fix should be applied
automatically for all users using ubuntu-2d or xsession and upgrading
their distribution."

Is there a list of acceptable values for this key?  If so, what are the
package dependencies?

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https://bugs.launchpad.net/bugs/1059137

Title:
  Cannot login after un upgrade from 12.04 to 12.10 (ubuntu-2d)

Status in “lightdm” package in Ubuntu:
  Confirmed
Status in “update-manager” package in Ubuntu:
  Confirmed

Bug description:
  After an upgrade from ubuntu 12.04 to 12.10, I was no more able to login with my usual account.
  Lightdm failed to load x session.
  After a long search, I understood that the problem was coming from ubuntu-2d xsession.
  My user account was configured to use unbuntu-2d when i was in ubuntu 12.04.
  But as this xsession has been removed in ubuntu 12.10, lightdm failed to load  it.

  I managed to fix my problem doing following steps :
   - edit my user file with gedit in this folder :
  /var/lib/AccountsService/users
   - replace "XSession=ubuntu-2d" by "XSession=ubuntu"
   - reboot ubuntu for the file modification to be taken in account.

  In my opinion, this fix should be applied automatically for all users using ubuntu-2d and upgrading their distribution.
  --- 
  ApportVersion: 2.5.3-0ubuntu1
  Architecture: amd64
  DistroRelease: Ubuntu 12.10
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  Package: update-manager
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.5.0-16.25-generic 3.5.4
  Tags:  quantal running-unity
  Uname: Linux 3.5.0-16-generic x86_64
  UpgradeStatus: Upgraded to quantal on 2012-09-30 (0 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare sudo

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