lightdm doesn't start due to misconfigured /etc/X11/default-display-manager

[S4qFBxkFFg]

On Ubuntu 11.10 lightdm was installed and working correctly; gdm was then installed and also worked correctly.

When gdm was removed, lightdm no longer started on boot, but could be started by typing "sudo start lightdm; exit" at the command prompt.

This was fixed by editing /etc/X11/default-display-manager and changing its contents from "lightdm" to "/usr/sbin/lightdm".

It appears that the installation/uninstallation of gdm does not restore this file correctly.

More information is available at:
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/875539
http://ubuntuforums.org/showthread.php?t=1871148

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/899603/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Vadim Rutkovsky (roignac)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:

  apport-collect 899603

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Sebastien Bacher (seb128)]

it's a duplicate of bug #864174