The maintainer scripts should have fixed the ownership of the /var/lib/mysql/.
According to the apt terminal log the error is:
Configurando mysql-server-5.1 (5.1.31-1ubuntu2) ...
* Stopping MySQL database server mysqld [ OK ]
* Starting MySQL database server mysqld [fail]
Do you still have the content of /var/log/daemon.log at the time of the upgrade to help figure out why mysqld failed to start?
The maintainer scripts should have fixed the ownership of the /var/lib/mysql/.
According to the apt terminal log the error is:
Configurando mysql-server-5.1 (5.1.31-1ubuntu2) ...
* Stopping MySQL database server mysqld [ OK ]
* Starting MySQL database server mysqld [fail]
Do you still have the content of /var/log/daemon.log at the time of the upgrade to help figure out why mysqld failed to start?