Installed from wget -O - http://autoinstall.plesk.com/one-click-installer | sh
As instructed from http://docs.plesk.com/en-US/12.5/deployment-guide/installing-plesk/manual-installation/installation-from-the-command-line.65780/
tried
mysql Ver 15.1 Distrib 5.5.44-MariaDB, for Linux (x86_64)...