you need to change the following menu entry by adding "nomodeset" - see the line starting with "linux"
menuentry "Ubuntu, Linux 2.6.31-14-generic" {
recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi
set quiet=1
insmod ext2
set root=(hd0,1)
search --no-floppy --fs-uuid --set 5c7c29e4-f877-4e6d-8b20-aed6eacd5ad3
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=5c7c29e4-f877-4e6d-8b20-aed6eacd5ad3 ro nomodeset quiet splash nomodeset
initrd /boot/initrd.img-2.6.31-14-generic
}
now reboot. we are almost there !!!
after rebooting the system, we again open the terminal and edit the grub default
$ gksudo gedit /etc/default/grub
here there a two changes which added the "nomodeset":
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
GRUB_CMDLINE_LINUX="nomodeset"
after saving the changes execute
$ sudo update-grub
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