I recently bought an Acer Aspire Revo and had one of my trainees put XMBC on a SDHC card today. So after a bit of toying earlier, I started looking at the thing (from the command line that is).

One thing, if you enable the PPA (ppa.launchpad.net) sources, apt/aptitude is gonna babble something about an unverified key.

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W: GPG error: http://ppa.launchpad.net jaunty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6D975C4791E7EE5E
W: GPG error: http://ppa.launchpad.net jaunty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2BBD133164234534
W: GPG error: http://ppa.launchpad.net jaunty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A956EB81318C7509

I ended up looking the error up (since I only have an Ubuntu desktop). There’s a simple solution for this:

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for i in 2BBD133164234534 A956EB81318C7509 6D975C4791E7EE5E
do
  gpg --keyserver wwwkeys.eu.pgp.net --recv-keys $i
  gpg --export --armor $i | apt-key add -
done

Alternatively you can also use this:

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for i in 2BBD133164234534 A956EB81318C7509 6D975C4791E7EE5E
  apt-key adv --keyserver=wwwkeys.de.pgp.net --recv-key $i
done