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It would help quite a bit to diagnose and/or reproduce this problem if you could include these two files: /etc/mysql/my.cnf /var/log/mysql/error.log Without those its impossible to determine why mysql is failing to start. Marking Importance Medium as it does not affect all users (able to install mysql on 11.04 without issues). Setting status to Incomplete pending response. ** Changed in: mysql-5.1 (Ubuntu) Importance: High => Medium ** Changed in: mysql-5.1 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/913252 Title: package mysql-server-5.1 5.1.54-1ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-5.1/+bug/913252/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs