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I removed Unity via the Software Store and rebooted.

Now I got the following error:

unable to load session 'ubuntu'

I can't log in as guest either.

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When did you get that error? Can you see the login screen? Can you enter in some TTY? – Lucio Apr 21 '13 at 21:38

Repair attempt:

Please open tty (virtual console, text mode only): Ctrl+Alt+F1


sudo apt-get update
sudo apt-get install ubuntu-desktop
sudo apt-get -f install
sudo dpkg-reconfigure ubuntu-desktop
sudo reboot

If above does not work, try:

sudo apt-get install gnome-session
sudo apt-get install lightdm
sudo apt-get install unity-greeter
sudo dpkg-reconfigure lightdm

The install commands will tell self-explanatory if it’s already installed or not.


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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Mitch May 13 '13 at 11:44

Because the problem is unable to load session 'ubuntu', So the solution might

sudo apt-get install ubuntu-session
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Yeah, but it's returning Unity. – aastefanov May 2 '14 at 10:23
I think you wanna back to Ubuntu unity. To change to other session like gnome, maybe this link can help.… – bagustris May 4 '14 at 4:15

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