Comment 2 for bug 806930

Thank you for taking the time to report this bug and helping to make Ubuntu better.

From your log file I see this:

110629 20:30:52 InnoDB: Shutdown completed; log sequence number 0 116181
invoke-rc.d: unknown initscript, /etc/init.d/mysql not found.
dpkg : erreur de traitement de mysql-server-5.1 (--configure) :
 le sous-processus script post-installation installé a retourné une erreur de sortie d'état 100

Did you perhaps move/rename the /etc/init.d/mysql script? this seems to be necessary to shutdown or restart the service as part of the upgrade process.

Please try the following command in a terminal to recreate /etc/init.d/mysql, which is only a symlink to upstart-job. Once it's been recreated, try the same procedure to upgrade that you were using originally.

sudo ln -s /lib/init/upstart-job /etc/init.d/mysql

Please don't forget to let me know if this helps clear up the problem.

Thanks!