Okay, to fix this you need to boot from the Live CD again and change your GRUB configuration on the harddisk to use a plain text mode instead of a graphics mode. Then follow this guide on how to chroot from the Live CD to your root partition on the harddisk, so that you can change the GRUB settings there.
https://help.ubuntu.com/community/Grub2#ChRootBUT!After step 7, before step 8, do:
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gksudo gedit /etc/default/grub
And uncomment the following line (remove the # in front of it):
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#GRUB_TERMINAL=console
If there also is a line starting with GRUB_GFXMODE in that file, comment that (place a # in front of it).
After that, you can save & close the file and do:
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sudo update-grub
Then you are done. So do
not continue after doing the above, so just follow the guide I linked to to step 7 and then do the above. Reboot to see if this works.