Get RAR & UNRAR to work with Gutsy Gibbon
I finished downloading a file that was in rar format. I browsed to the directory that the file was located in. I then right-clicked on Open with “Archive Manager” as I always did with previous versions of Ubuntu. I was then greeted with a lovely error message stating that it was an unknown file format. Well whatever should I do?
I immediately went to Ubuntu forums to search for an answer. It turns out that I needed to install RAR to make it work. So go to System > Administration > Synaptic Package Manager. Do a search for RAR, and mark for install by clicking on the box. Click Apply then input your sudo password and away you go. You will now be able to unrar RAR files.