You're trying to downgrade mysql 5.1 to 5.0 which is not supported.
** Changed in: mysql-dfsg-5.0 (Ubuntu)
Status: New => Won't Fix
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package mysql-server-core-5.0 5.1.30really5.0.75-0ubuntu5 failed to
install/upgrade: tried to overwrite `/usr/sbin/mysqld', witch is already
provided by mysql-server-5.1
https://bugs.launchpad.net/bugs/325809
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