MySQL stop working, when i tried to reinstall, this error occurs

[Adam Mendes]

Suddenly, my MySQL Server stop working. I reboot the Computer and the problem persists.
I have tried to remove, through the Ubuntu App Center and then when i try to reinstall, this problem pop's out.

ProblemType: Package
DistroRelease: Ubuntu 13.04
Package: mysql-server-5.5 5.5.31-0ubuntu0.13.04.1
ProcVersionSignature: Ubuntu 3.8.0-22.33-generic 3.8.11
Uname: Linux 3.8.0-22-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.9.2-0ubuntu8
AptOrdering:
 mysql-server: Remove
 mysql-server-5.5: Configure
Architecture: amd64
Date: Mon Jun 17 18:39:05 2013
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2013-05-11 (38 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: mysql-5.5
Title: package mysql-server-5.5 5.5.31-0ubuntu0.13.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Robie Basak (racb)]

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

Please could you attach the file "/etc/apparmor.d/usr.sbin.mysqld". Once done, please change the bug status back to New. Thanks!

[Adam Mendes (chon-hc-gmail)]

Here is the file.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.