Mint 12 - Error updating MySQL (mysql-client-core-5.1)

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http://unix.stackexchange.com – I have MySQL 5.5 installed via packages.dotdeb.org. When trying to update 5.1, which is also installed, I get the following error: E: /var/cache/apt/archives/mysql-client-core-5.1_5.1.66-0ubuntu0.11.10.2_amd64.deb: trying to overwrite '/usr/share/man/man1/mysqlcheck.1.gz', which is also in package mysql-client-core-5.5 5.5.28-1~dotdeb.0 I'm unsure how to proceed. I installed 5.1 before learning how to get more up-to-date packages in Mint's update/package manager. I don't want to keep 5.1 since I do have 5.5, but I'm concerned that removing it via apt will mess up my 5.5 installation. (HowTos)