Debian and Ubuntu packages from Percona are signed with a key. Before using the repository  you ought to add the key to apt.

For that run the following commands:

Step1. Add the Percona repository:

gpg –keyserver hkp://keys.gnupg.net –recv-keys 1C4CBDCDCD2EFD2A
gpg -a –export CD2EFD2A | sudo apt-key add -
echo “deb http://repo.percona.com/apt squeeze main” >> /etc/apt/sources.list
echo “deb-src http://repo.percona.com/apt squeeze main” >> /etc/apt/sources.list

Step2. Install Percona Server:

apt-get update
apt-get install  percona-server-server-5.5

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