Apt-get upgrade broke MySQL

Just did an apt-get update && apt-get upgrade on Debian 7 and now it's saying

Setting up mysql-server-5.5 (5.5.40-0+wheezy1) ...
[ ok ] Stopping MySQL database server: mysqld.
[FAIL] Starting MySQL database server: mysqld . . . . . . . . . . . . . . failed!
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing mysql-server-5.5 (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.5; however:
  Package mysql-server-5.5 is not configured yet.

dpkg: error processing mysql-server (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 mysql-server-5.5
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)

I tried dpkg-reconfigure mysql-server-5.5 but it just says /usr/sbin/dpkg-reconfigure: mysql-server-5.5 is broken or not fully installed

It was working fine before I upgraded, now I can't get MySQL to start at all.

http://ift.tt/1dvHQ0Z