Public bug reported:

After upgrading to 12.04.1 LTS (from the previous LTS) my ubuntu will at
times fail to show the login screen. Roundabout 4 out of 10 times of
booting the "Ubuntu five dots"-screen disappears, no login screen (GDM)
appears but only tty1, with "login: ".

If I then login and do "sudo gdm"

I get the message:

failed to acquire org.gnome.displaymanager
could not acquire name; bailing out.

Whatever I try I can't solve this problem. A reboot (or two or three)
may finally result in the normal GDM-login screen and Ubuntu working
normally.

Ps I have switched from lightdm to GDM because lightdm gave many more
problems than GDM now does.

Jeet suggests I report this as a bug

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Description changed:

  After upgrading to 12.04.1 LTS (from the previous LTS) my ubuntu will at
  times fail to show the login screen. Roundabout 4 out of 10 times of
  booting the "Ubuntu five dots"-screen disappears, no login screen (GDM)
  appears but only tty1, with "login: ".
  
  If I then login and do "sudo gdm"
  
  I get the message:
  
  failed to acquire org.gnome.displaymanager
  could not acquire name; bailing out.
  
  Whatever I try I can't solve this problem. A reboot (or two or three)
  may finally result in the normal GDM-login screen and Ubuntu working
  normally.
  
- Any advice?
- 
  Ps I have switched from lightdm to GDM because lightdm gave many more
  problems than GDM now does.
  
- Please advice.
+ Jeet suggest I report this as a bug

** Description changed:

  After upgrading to 12.04.1 LTS (from the previous LTS) my ubuntu will at
  times fail to show the login screen. Roundabout 4 out of 10 times of
  booting the "Ubuntu five dots"-screen disappears, no login screen (GDM)
  appears but only tty1, with "login: ".
  
  If I then login and do "sudo gdm"
  
  I get the message:
  
  failed to acquire org.gnome.displaymanager
  could not acquire name; bailing out.
  
  Whatever I try I can't solve this problem. A reboot (or two or three)
  may finally result in the normal GDM-login screen and Ubuntu working
  normally.
  
  Ps I have switched from lightdm to GDM because lightdm gave many more
  problems than GDM now does.
  
- Jeet suggest I report this as a bug
+ Jeet suggests I report this as a bug

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https://bugs.launchpad.net/bugs/1110580

Title:
  no gdm at start up. only tty (not really working either)

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