Plesk 12 installation fails on OpenSUSE 13.1 with the error:
===> Checking for the necessary system accounts
Checking for the system groups and users necessary for MySQL...
Checking for the group ''...
Trying to add group ''... groupadd: '' is not a valid group name
ERROR while trying to add group ''
Such behavior is considered as software issue, internal ID is PPPM-1833 . Root cause is absent syslog package. The issue should be fixed in further Parallels Plesk updates.
To solve the issue install syslog manually before product installation.