This seems to be related to the move of /var/run to tmpfs: http://lists.ubuntu.com/archives/ubuntu-devel-announce/2006-January/000048.html
Then, it has to be a wrong setting in the mysql-server part that creates this directory on startup.
This seems to be related to the move of /var/run to tmpfs: http:// lists.ubuntu. com/archives/ ubuntu- devel-announce/ 2006-January/ 000048. html
Then, it has to be a wrong setting in the mysql-server part that creates this directory on startup.