Mysql - reinstall (with db remove) + no root pass

apt+dpkg.sh

apt-get remove mysql-server mysql-client mysql-server-core* mysql-client-*

rm -rf /var/lib/mysql /etc/mysql
update-alternatives --remove my.cnf /etc/mysql/my.cnf.fallback    
update-alternatives --remove my.cnf /etc/mysql/my.cnf
update-alternatives --remove my.cnf /etc/mysql/mysql.cnf

apt-get install mysql-server mysql-client mysql-server-core* mysql-client-*

dpkg --force-confmiss --install /var/cache/apt/archives/mysql-*

pass.sql

UPDATE mysql.user SET plugin = 'mysql_native_password' WHERE user =  'root';
SET PASSWORD FOR 'root'@'localhost' = '';
FLUSH PRIVILEGES;