Some software: Ubuntu 16.04.1 TLS, PHP 7.0.8, MySQL-5.7, Apache2
The essence of the problem - does not allow in phpmyadmin. The fact is that when installing mysql I did not set a password for root. During the installation of phpmyadmin there were also no requests to set a password (I reinstalled several times already). But damn, you need to log in to login, login without a password is not allowed. Confused what to do? I'm afraid I have already picked something wrong in the MySQL settings.