I believe this bug has been fixed in the newest version of mysql-server-5.0, since /var/lib/dpkg/info/mysql-server-5.0.postrm contains rm -rf /var/lib/mysql which will not fail.
I believe this bug has been fixed in the newest version of mysql-server-5.0, dpkg/info/ mysql-server- 5.0.postrm contains
since /var/lib/
rm -rf /var/lib/mysql
which will not fail.