dstiles - 8:54 pm on Dec 14, 2012 (gmt 0)
Have to say my (working) ubuntu machines are still Lucid (v10.04) and will never be any more recent - didn't get on with v12 at all. Also I use USB printing - no wireless here at all.
My latest linux is Mint Maya (v13) with Mate interface and that's fine.
Even so, it looks as if something on your system has installed with incorrect permissions, especially for mail.