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When you first install MySQL or MariaDB, root password is set to blank. So when you are trying to use a command such as mysql_secure_installation, you should be able to log into the root user account just by leaving it empty and hit ENTER. But you are here because it doesn’t work, right?
Solution
Instead of running
$ mysql_secure_installation
run the command with sudo instead
$ sudo mysql_secure_installation
Considering donating if you found my post helpful 😊