Try MariaDB instead of Percona #10
This is a pisser.  It claims to support various releases of Debian, but the
sources.list entries are broken and just 404.  Looking at
http://ftp.utexas.edu/mariadb/repo/10.1/debian/dists/, only stable and the
previous stable are supported.  Maybe that's good enough and works and I can
rewrite it to just fetch squeeze.  I don't know.  Come back to this point
to try I guess.