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It looks like there was a problem during the configuration step of the installation. Please can you try running: dpkg-reconfigure mysql-server-5.1 Hopefully this should re-configure the root password for mysql-server and restart the service. Please update this bug if this resolved your issue. Thanks ** Changed in: mysql-dfsg-5.1 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to mysql-dfsg-5.1 in ubuntu. https://bugs.launchpad.net/bugs/720513 Title: package mysql-server-5.1 5.1.41-3ubuntu12.9 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs