The following message exists at Plesk Home page:
The repair operation is in progress. You will be redirected to the login page when it completes
Upgrade failed. To remove this notice, remove the file /var/lock/parallels-panel-upgrade-failure.flag from the server
Last Plesk update finished successfully. No errors or warnings can be detected in the
The previous Plesk update was marked as failed, thus the warning persists in Plesk UI.
There are Plesk installation or repair locks:
# ls /var/lock/parallels*