Hello,
Not to sound rude, you do realise that this is an electronics forum and not a *nix forum.
ubuntuforums and debian forums are the ones where you should be looking.
PS: Granted, people here will help you out eventually but not spoonfeed. Please do your research first and approach if you still cannot find a solution.
Three back-to-back posts wont guarantee faster response.
From the looks of it, you are not having much experience with *nix either. First use the desktop version to get acquainted then
approach the embedded ones like pi and BBB.