I have had my Canon MP280 scanner working but since various updates it is no longer recognised despite following all the "answers" on this site and others. It does not work at all with simple scan, scangearmp or gimp. Nothing recognises it. The printer part still works.
Press Ctrl-Alt-t, in the terminal run:
you should get a prompt to install new packages, install them. report back
It would be helpful if you provided us with a list of specific things you tried that didn't work.