以MySQL- 5.7.18為例:

sudo apt-get autoremove --purge mysql-server-5.7 
#sudo apt-get remove mysql-server         # 沒用到,已經沒有mysql-server
#sudo apt-get autoremove mysql-server  # 沒用到,已經沒有mysql-server
sudo apt-get remove mysql-common
sudo rm -rf /etc/mysql/  /var/lib/mysql    #很重要
#清理殘留數據
dpkg -l |grep ^rc|awk ‘
 
{print $2}‘ |sudo xargs dpkg -P  
sudo apt autoremove
sudo apt autoreclean

執行dpkg -l |grep ^rc|awk ‘{print $2}‘ |sudo xargs dpkg -P ,效果圖:

安裝MySQL:

sudo apt-get install mysql-server
sudo apt-get install mysql-client
sudo apt-get install libmysqlclient-dev

ubuntu16.04 徹底卸載MySQL