May be a duplicate of bug #588940. Changing from

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to that

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"

in file /etc/default/grub and issuing the command

update-grub

solved the problem for me. Give it a try.

-- 
Screen corruption when X starts
https://bugs.launchpad.net/bugs/619365
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