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I upgraded from 11.04 to 12.04. After closing the computer and trying to login again, it presented me with failed to load session "ubuntu".

What can I do to rectify the problem?

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marked as duplicate by bain, Eric Carvalho, Warren Hill, bodhi.zazen, saiarcot895 Jul 17 '14 at 18:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Do you have Compiz installed? – Mitch Oct 21 '13 at 10:54

Ubuntu recommends only upgrade to it's immediate successor release versions. i.e: 11.04 to 11.10, 11.10 to 12.04 etc. I am not sure this will work or not, but try this.

on the login screen press Alt+Ctrl+f1 and go to tty1 and type following commands.

sudo apt-get -f install


sudo apt-get update
sudo apt-get install unity-2d
sudo apt-get install ubuntu-desktop
sudo apt-get install compizconfig-settings-manager
sudo apt-get install compiz-plugins-extra
sudo apt-get update 

After that restart your pc.

sudo shutdown -r now

Hope this will work for you.

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