https://help.ubuntu.com/community/MysqlPasswordReset

Sometimes MySql can’t be stopped, try this command:

mysqladmin -u root -p shutdown

Reference:

• http://ubuntuforums.org/showthread.php?t=1374747
• Install phpmyadmin on Ubuntu:
  https://help.ubuntu.com/community/phpMyAdmin
  http://linadonis.pixnet.net/blog/post/27585552-ubuntu-server-%E5%AE%89%E8%A3%9D-phpmyadmin