$ plesk repair installation
Reconfiguring the Plesk installation
Started bootstrapper repair procedure. This may take a while.
Certain actions may be skipped if not applicable.
Finishing up upgrade procedures and rerunning previously failed upgrade actions...
===> Cumulative APS controller database (apsc) upgrade and repair has been started.
===> Cumulative upgrade and repair of APS controller database has been completed.
===> Cumulative APS controller upgrade and repair (final stage) has been started.
===> Cumulative upgrade and repair of APS controller (final stage) has been completed.
===> Cumulative Plesk database upgrade and repair (revertable stage) has been started.
===> Preparing Plesk database upgrade (revertable stage).
===> Cumulative upgrade and repair of Plesk database (revertable stage) has been completed.
===> Plesk database scheme upgrade has been started.
Applying migrations from: /usr/local/psa/bootstrapper/pp17.5.3-bootstrapper/migrations/
===> Plesk database scheme upgrade has been completed.
===> Cumulative Plesk upgrade and repair (final stage) has been started.
===> Preparing Plesk upgrade (final stage).
===> Cumulative upgrade and repair of Plesk (final stage) has been completed.
Reconfiguring mail subsystem...
Reconfiguring Apache web server...
Reconfiguring ProFTPD FTP server...
===> Configuring ProFTPD server
Reconfiguring AWStats web statistics...
Reconfiguring WatchDog...
Restoring SELinux contexts...
drwebd.service is not a native service, redirecting to /sbin/chkconfig.
Executing /sbin/chkconfig drwebd on
Job for drwebd.service failed because a configured resource limit was exceeded. See "systemctl status drwebd.service" and "journalctl -xe" for details.
INFO: [Wed Feb 21 21:02:12 CET 2018]: Serice: drwebd, Action: start
Trying to start service drwebd... failed
Feb 21 21:02:12 vl53962 drwebd[8522]: A path to a valid license key file was not specified.
Feb 21 21:02:12 vl53962 drwebd.real[8525]: A path to a valid license key file was not specified.
Feb 21 21:02:12 vl53962 drwebd[8522]: Plesk authorization failed: cannot load Plesk public key from - No such file or directory
Feb 21 21:02:12 vl53962 drwebd.real[8525]: Plesk authorization failed: cannot load Plesk public key from - No such file or directory
Feb 21 21:02:12 vl53962 drwebd[8522]: Error: Plesk Software not running.
Feb 21 21:02:12 vl53962 drwebd.real[8525]: Error: Plesk Software not running.
Feb 21 21:02:12 vl53962 systemd[1]: PID file /var/drweb/run/drwebd.pid not readable (yet?) after start.
Feb 21 21:02:12 vl53962 systemd[1]: Failed to start LSB: drwebd is a Dr.Web Daemon.
Feb 21 21:02:12 vl53962 systemd[1]: Unit drwebd.service entered failed state.
Feb 21 21:02:12 vl53962 systemd[1]: drwebd.service failed.
WARNING!
Some problems are found during start service drwebd(see log file: /var/log/plesk/rc_actions.log)
Continue...
Reconfiguring SSL ciphers and protocols...
Regenerating web servers' configuration files...
Cleaning active Panel sessions...
Bootstrapper repair finished.
If problems persist, please check installer logs ('/var/log/plesk/install/plesk_17.5.3_repair.log' and '/var/log/plesk/install/plesk_17.5.3_repair_problems.log') for errors.
If you can't resolve the issue on your own, please address Parallels support.