sudo dpkg -i mysql-server-5.0_5.0.96-0ubuntu3ppa1_amd64.deb
(Reading database ... 187041 files and directories currently installed.)
Preparing to replace mysql-server-5.0 5.0.96-0ubuntu3ppa1 (using mysql-server-5.0_5.0.96-0ubuntu3ppa1_amd64.deb) ...
 * Stopping MySQL database server mysqld                                 [ OK ]
 * Stopping MySQL database server mysqld                                 [ OK ]
Unpacking replacement mysql-server-5.0 ...
Setting up mysql-server-5.0 (5.0.96-0ubuntu3ppa1) ...
 * Stopping MySQL database server mysqld                                 [ OK ]
 * Reloading AppArmor profiles                                                  Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox
Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
                                                                         [ OK ]
 * Starting MySQL database server mysqld                                 [fail]
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing mysql-server-5.0 (--install):
 subprocess installed post-installation script returned error exit status 1
Processing triggers for ureadahead ...
Processing triggers for man-db ...
Errors were encountered while processing:
 mysql-server-5.0