1. Stop MySQL using the following command: sudo /etc/init.d/mysql stop
2. Copy the existing data directory (default located in /var/lib/mysql) using the following command:sudo cp -R -p /var/lib/mysql /newpath
3. edit the MySQL configuration file with the following command:gedit /etc/mysql/my.cnf
4. Look for the entry for datadir, and change the path (which should be /var/lib/mysql) to the new data directory.
5. In the terminal, enter the command:sudo gedit /etc/apparmor.d/usr.sbin.mysqld
6. Look for lines beginning with /var/lib/mysql. Change /var/lib/mysql in the lines with the new path.
7. Save and close the file.
8. Restart the AppArmor profiles with the command:sudo /etc/init.d/apparmor reload
9. Restart MySQL with the command:sudo /etc/init.d/mysql restart
10. Now login to MySQL, and you can access the same databases you had before.

原文地址