I am planning on setting up about 20 computers at a school with Ubuntu which presently have Windows XP. The move should be easy as the computers are already locked down and the users simply open desktop icons to do things. We use a program called Fortres on Windows to prevent users from deleting and moving icons. Is there a way in Ubuntu to accomplish this either with a program or through changing permissions on the desktop icons?
Each computer will have three accounts on them: admin, teacher, and student. We do not have accounts made for each user.