mysql-server-5.1 failure

sudo dpkg --configure mysql-server-5.1
Instellen van mysql-server-5.1 (5.1.58-1ubuntu1) ...
apparmor_parser: Regex grouping error: Unclosed grouping or character class, expecting close }
apparmor_parser: Unable to parse input line '/{,var/run/mysqld/mysqld.pid'
apparmor_parser: Regex grouping error: Unclosed grouping or character class, expecting close }
apparmor_parser: Unable to parse input line '/{,var/run/mysqld/mysqld.sock'
ERROR processing regexs for profile /usr/sbin/mysqld, failed to load
start: Job failed to start
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: fout bij afhandelen van mysql-server-5.1 (--configure):
 subproces installed post-installation script gaf een foutwaarde 1 terug
Fouten gevonden tijdens behandelen van:
 mysql-server-5.1