(replace KEY with you get from the error messages.)
gpg --keyserver subkeys.pgp.net --recv KEY gpg --export --armor KEY | sudo apt-key add -
gpg --keyserver subkeys.pgp.net --recv KEY gpg --export --armor KEY | sudo apt-key add -
control userpasswords2

http://blog.chinaunix.net/u/16882/showart_2008304.html
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