Solved : ERROR 1698 (28000): Access denied for user ‘root’@’localhost’

How to Fix error for MySQL 5.7 with Ubuntu 18.04 : ERROR 1698 (28000): Access denied for user ‘root’@’localhost’

In Ubuntu systems running MySQL 5.7 (and later), the root user is authenticated by the auth_socket plugin by default.

$ sudo mysql #No Username to be the provide
mysql> USE mysql;
mysql> SELECT User, Host, plugin FROM mysql.user;

+------------------+-----------+-----------------------+
| User             | Host      | plugin                |
+------------------+-----------+-----------------------+
| root             | localhost | auth_socket           |
| mysql.session    | localhost | mysql_native_password |
| mysql.sys        | localhost | mysql_native_password |
| debian-sys-maint | localhost | mysql_native_password |
+------------------+-----------+-----------------------+

mysql> update user set plugin='mysql_native_password' where user='root';
mysql> FLUSH PRIVILEGES;
mysql> exit;
$ service mysql restart

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