Ever since upgrading to Ubuntu 11.04 there has been no display settings and no way to turn on Unity. Incidentally I got a command line off another forum and tried to force it and the computer had a hissy fit on me then in the end did not turn Unity on or in fact change anything

normally i'd see options here


and also in System/Preferences but no display settings. I went through right clicking on applications and edit menus but it wasnt even there.

Fair warning i'm almost useless with the jargon and command lines so any explanation is gonna have to be in pretty basic language