I did experience the same issue Alex had this morning. apt-get update failed at starting the MySQL server after updating the package. The last 3 mysql-bin logs had root:root as owner and this prevented the mysql server from starting. I tried resetting the permissions and the run upt-get upgrade again, but this resulted in the same issue.
I have been able to succesfully run the update by runnign chmod -R mysql: /var/lib/mysql from another console at the moment the upgrade script tried to restart the mysql server. After that the server starts without problems and apt-get reported a succesfull update. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org