Ubuntu Reinstallation Method after Removing mysql

First delete mysql:

sudo apt-get remove mysql-*

Then clean up the residual data

dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P

It will pop up 1 dialog box, you select yes is good

Then install mysql

sudo apt-get install mysql-client mysql-server

You will be prompted to set the root password during installation. If you do not clean up the residual data during uninstallation, you will not be prompted to set the root password

Check if mysql is running

sudo service mysql status

1 will run automatically after the installation is completed.

If it is not running, you can

sudo service mysql start

Summarize