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

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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.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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

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Cannot login after un upgrade from 12.04 to 12.10 (ubuntu-2d)
https://bugs.launchpad.net/bugs/1059137
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