After I installed phpmyadmin, and run it with localhost/phpmyadmin I get error:
phpMyAdmin - Error The mbstring extension is missing. Please check your PHP configuration
When I check php -m console displays that mbstring is already installed. PHP version: 7.2.4 Installed phpmyadmin via apt-get install phpmyadmin
In directory /etc/php I got 3 subfolders - 7.1, 7.2, 7.3