Ubuntu下MySQL报错：ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

root@JD:~# mysql -uroot -p

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

vi /etc/mysql/mysql.conf.d/mysqld.cnf

service mysql restart

mysql -uroot -p

use mysql;
update mysql.user set authentication_string=password('新密码') where user='root'and Host ='localhost';
update user set plugin="mysql_native_password"; 
flush privileges;
quit;

vim /etc/mysql/mysql.conf.d/mysqld.cnf
# 英文输入环境下，敲 i 键，进入插入模式
#上下左右键移动光标，确保 bind-address = 127.0.0.1没有被注释掉
#英文输入环境下，敲Esc键，输入:wq 保存退出

mysql -u root -p 
#新密码
mysql>