[mysql]通过service mysql restart重启提示unknown job的解决方法

sudo touch /var/run/utmp
sudo chmod 664 /var/run/utmp
sudo reboot

sudo apt-get purge mysql-server
sudo apt-get purge mysql-common
sudo rm -rf /var/log/mysql
sudo rm -rf /var/log/mysql.*
sudo rm -rf /var/lib/mysql
sudo rm -rf /etc/mysql
sudo apt-get install mysql-server --fix-missing --fix-broken