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I installed XEN using these instructions

Now when I rebooted virtualbox doesnt work, X doesnt work, lightdm doesnt work

How can I set it back to how it was before? I presume I want to revert the following actions:

Modify GRUB to default to booting Xen:

sudo sed -i 's/GRUB_DEFAULT=.*\+/GRUB_DEFAULT="Xen 4.1-amd64"/' /etc/default/grub
sudo update-grub

Can someone tell me how?

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Please pastebin /etc/default/grub and ls -l /boot -- thanks – izx Jul 26 '12 at 19:17

To roll-back, set GRUB_DEFAULT=0 in /etc/default/grub then update-grub

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if you are trying to run X on domU, you can do it by following the instructions here. i don't understand from your question what virtualbox has to do with it?

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