After trying to upgrade to gnome 3.12 unable to upgrade// uninstalled gnome 3.12 however lost ubuntu 14.04 default login screen Plz help
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This is more of a comment, but I lack the reputation... If @Michael's answer doesn't work, it could be an issue with lightdm. If so, you can install gdm to get you logged in.
To Install:
$ sudo apt-get install gdm
To (Re)configure / switch back to lightdm
$ sudo dpkg-reconfigure gdm
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This worked well for me and I appreciate the additional info on how to return to lightdm (although I'm sticking with gdm for now - it's good enough and works :) – JulianHarty Sep 7 '15 at 9:49
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You can use tty pushing ctrl + alt + f6 that goes to tty, and then you just have to type:
sudo apt-get update
sudo apt-get install --reinstall ubuntu-desktop
sudo -i shutdown
and that might work, and have installed it again.
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I tried this approach first, while it didn't fix my grumpy Ubuntu (14.04 LTS) I did learn something useful and it was well worth trying, thank you. – JulianHarty Sep 7 '15 at 9:48
