How to start MySQL on Linux

1.Fitst,stop and uninstall the old mysql

sudo systemctl stop mysql
sudo apt-get remove --purge mysql-server mysql-client mysql-common
sudo apt-get autoremove
sudo apt-get autoclean
sudo rm -rf /etc/mysql /var/lib/mysql /var/log/mysql
sudo rm -rf /etc/my.cnf

2.Reinstall the mysql

sudo apt-get update
sudo apt-get install mysql-server
sudo systemctl start mysql

3.Login in

mysql -u root -p