Comment 4 for bug 383087

It seems that you're using a non-standard location to hold your data (/home/mysql). There may be an issue with mysqld AppArmor profile. See https://wiki.ubuntu.com/DebuggingApparmor for more information to deal with this issue.

Could you please provide the following information:

 * apparmor audit messages related to mysqld:

    /var/log/kern.log

 * mysqld apparmor profile:

    /etc/apparmor.d/usr.sbin.mysqld

 * mysql configuration stripped of private information (such as password):

    /etc/mysql/my.cnf

 * extra mysql configuration from the conf.d directory:

    /etc/mysql/conf.d/