SymptomsAppArmor is a security tool that uses name-based mandatory access controls to restrict or confine the system access of “at risk” applications. AppArmor is not supported by Parallels Plesk Panel. Sometimes AppArmor can interfere with Plesk installation or functionality.
Disable AppArmor using the following commands:
# /etc/init.d/apparmor teardown
# update-rc.d -f apparmor remove