MySQL 업데이트 실패(debian)

MySQL 서버(pkg mysql-server5.5)를 업데이트할 때 문제가 발생했습니다. MySQL 서버를 "중지할 수 없습니다".

[FAIL] Stopping MySQL database server: mysqld failed!
invoke-rc.d: initscript mysql, action "stop" failed.
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
[FAIL] Stopping MySQL database server: mysqld failed!
invoke-rc.d: initscript mysql, action "stop" failed.
dpkg: error processing /var/cache/apt/archives/mysql-server-5.5_5.5.44-0+deb7u1_armhf.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
[FAIL] Stopping MySQL database server: mysqld failed!
invoke-rc.d: initscript mysql, action "stop" failed.