Ubuntu 18.04 mysql install

sudo apt install mysql-server

sudo mysql -u root

mysql> FLUSH PRIVILEGES;

mysql> use mysql;

mysql> UPDATE user SET plugin="mysql_native_password" WHERE User='root';

mysql> UPDATE user SET authentication_string=PASSWORD("***") WHERE User='root';
# *** is your password

mysql>UNINSTALL COMPONENT "file://component_validate_password";

mysql> quit

sudo service mysql restart