Hi, so I did yet another install of XBMC on Ubuntu 11 as I seem to have broken my old setup. I'll chalk that one up to a bad case of the sausage fingers.
I noticed that I forgot a step in the previous tutorial. The XBMC PPA keyring.
If you get the errors listed below about no GPG key after adding the Maverick PPA lines to /etc/apt/sources.list and then doing apt-get update, then try the command further below and it should correct it.
W: GPG error: http://ppa.launchpad.net maverick Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6D975C4791E7EE5E
$ apt-get install xbmc-ppa-keyring
After running the above command you should no longer get any errors when updating apt and you can continue along with the XBMC installation as listed in the previous post.
Next installment I'll probably have some nice bit about alternate ways to share files and access the system, along with some fine tuning of Ubuntu and XBMC.
-Colin.