Comment 24 for bug 838792

raggar (mbaart) wrote :

I found a possible solution to this bug. It has something to do with the auto login function in the user management from Unity. When activated it cannot shutdown anymore. Also disable the auto login is not possible anymore.

What I did:
$sudo gedit /etc/lightdm/lightdm.conf

remove the line:
autologin-user= YOUR USERNAME

Restart your computer with:
$sudo shutdown -h now

After that I had a system that worked normally again.