[ubuntu] What to do... What to do... ?

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http://ubuntuforums.org – I have a story pages long about my recent Ubuntu experience. I don't want to bore any one though. So here it is... I completely jacked my desktop. I had to install Kubuntu to get logged in to a working desktop. I just want to get back to what I had which was Gnome. I believe the only way to do this is to start from scratch. Unless someone has a suggestion on recovery without it. I don't want to lose everything I have on my system so I will have to make a backup. The thing is I don't know how to backup without getting all the junk in there that ruined my desktop in the first place. Ca (Hardware)