ERROR 1044 (42000): Access denied for user "@ ' localhost ' to database ' MySQL '

Solution 1:
1. Turn off MySQL
# Service Mysqld Stop
2. Blocking permissions
# Mysqld_safe--skip-grant-tables
3. Start a new terminal input
# mysql-u Root MySQL
Mysql>update Mysql.user Set Authentication_string=password (' 123456 ') where user= ' root ';
Mysql> FLUSH privileges;// Remember to say this, otherwise if you close the previous terminal, the original error will appear
mysql>exit;

Solution2:
1. Turn off MySQL
# Service Mysqld Stop
2. Blocking permissions
# Mysqld_safe--skip-grant-tables
3. Start a new terminal input
# mysql-u Root MySQL
mysql> Delete from user where user= ';
Mysql> FLUSH privileges;// Remember to say this, otherwise if you close the previous terminal, the original error will appear
Mysql> exit;

In the process of modifying the password, the situation encountered:

To view logs:

Workaround:

sudo service MySQL status

sudo service MySQL stop

If you had issue stopping then do following

Search for process:

PS aux | grep mysqld

Kill the process:

Kill-9 process_id

Now start MySQL on Safe mode with skip Grant

To troubleshoot problems encountered, continue to execute Solution1 or Solution2

ERROR 1044 (42000): Access denied for user "@ ' localhost ' to database ' MySQL '