There appears to be a bug in Debian’s key signing system. Depending on your apt sources you may run in to packages signed by a key that Debian doesn’t like. Annoyingly, these are Debian-signed packages, but unless you want to fix it, here is a workaround.
http://non-us.debian.org is a repository signed with F1D53D8C4F368D5D, but [...]
Brain Goo
Carpe Crap ‘em
