Compiz messed up the other day and erased my status bar. This was not uncommon, but this time it wouldnt let me open up the terminial to fix it. After a long time, i found out how to uninstall compiz from recovery, and i did. i then proceded to run dpkg from recovery. I booted my computer up, and Ubuntu is gone! all i can boot up into is my gnome shell. How do i fix this???? Is there a command to reinstall the ubuntu shell? PLEASE HELP!!!