root@ubuntu:~# service mysql start
start: Job failed to start
root@ubuntu:~#
root@ubuntu:~# cat /var/log/mysql/error.log
121125 17:07:38 [Note] Plugin 'FEDERATED' is disabled.
121125 17:07:38 InnoDB: The InnoDB memory heap is disabled
121125 17:07:38 InnoDB: Mutexes and rw_locks use GCC atomic bu
Thank you for taking the time to report this bug and helping to make
Ubuntu better.
The lack of error log is bug 1014732 and an update should be available
for it soon. In the meantime, you can manually add:
log_error = /var/log/mysql/error.log
to /etc/mysql/my.cnf.
Please could you do that