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If you want to downgrade or test something on an older version or MariaDB on a Debian/Ubuntu server, you can add the old version repository then install the packages of the old version simply ; for example on Debian Squeeze amd64 with 5.5.33 installed and you want to downgrade to 5.5.32 :
You can find the version string you need with "apt-cache policy mariadb-server-5.5". It's "5.5.32+maria-1squeeze" in my example.
Then install the packages (adjust the version string to your needs) :
It will ask you if you are sure that you want to downgrade.
ps: don't forget to backup your datas if its not a test server, as downgrading could break things and if possible dump all the datas before the downgrade then import it back after.