APT: Public Key is missing? How to fix?

Solution 1:

You have to add the key to apt using apt-key:

gpg -a --output /tmp/pub.asc --export 1C4CBDCDCD2EFD2A
sudo apt-key add /tmp/pub.asc && rm /tmp/pub.asc

cf. http://blog.edseek.com/archives/2007/03/17/apt-key-gpg-key-import-on-ubuntu-and-debian/

Solution 2:

The key is also directly available from the Percona website. Import it as following:

wget -O - http://www.percona.com/redir/downloads/RPM-GPG-KEY-percona | gpg --import
gpg --armor --export 1C4CBDCDCD2EFD2A | apt-key add -

Edit: Percona is going to change their SSH key before the end of this year. See instructions on their website http://www.percona.com/ssh-key-rotation/instructions