Completely delete clean mysql (including configuration files) in ubuntu

1Delete mysql data files

sudo rm /var/lib/mysql/ -R

2 Delete the mysql configuration file

sudo rm /etc/mysql/ -R

(These two steps are very important and many articles have not written them)

3 dpkg --list|grep mysql to view mysql dependencies

 4 Start removing dependencies

 4.1 Uninstall command: sudo apt-get remove mysql-common

4.2 Uninstall command: sudo apt-get autoremove --purge mysql-server-8.0

4.3 To clear residual data, run the command: dpkg -l|grep ^rc|awk '{print$2}'|sudo xargs dpkg -P

Check the remaining dependencies of MySQL again and run the command: dpkg --list|grep mysql

If there is no return, the deletion is complete (basically it will be deleted). If it is not deleted, continue to delete the displayed dependent packages.

Finish!