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I have a corrupt guest install of ubuntu 12.04 running on virtualbox 4.2.6. I cannot boot to graphical mode . I get an error “failed to load session “Ubuntu”" How can I remove information from the virtual disk or repair it? Networking is also disabled

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Try moving /etc/X11/xorg.conf to a /etc/X11/xorg.conf.backup.

I think the correct syntax would be :

sudo service lightdm stop , sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.backup , sudo service lightdm start , or sudo init 6 to restart the machine

The system will recreate xorg.conf by itself...

Of course, if you don't see the login screen, use alt+ctrl+f1 - f6

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