sudo apt-get remove --purge compiz-* in case of not being able to do it from the installed grub it is possible to use initiating from supergrub2 http://www.supergrubdisk.org/super-grub2-disk/
sudo apt-get remove --purge compiz-* www.supergrubdi sk.org/ super-grub2- disk/
in case of not being able to do it from the installed grub it is possible to use initiating from supergrub2
http://