This message has been printed while executing univention-app upgrade kopano-meet.
Here is an extract of the log:
Starting kopano_kwmserver ... done
Starting kopano_grapi ... done
Starting web ... done
Starting kopano_kapi ... done
Starting kopano_meet ... done
Starting kopano_ssl ... done
Starting kopano_konnect ... done
19049 actions.start.progress 20-02-09 20:26:26 [ DEBUG]: 100
19049 docker.base.container.b567 20-02-09 20:26:29 [ DEBUG]: Using container.b567 for container b5677e7808fb57bf5b6e6a329b6df5179f04f7d5d2c5506f967eb5923540c08d
19049 docker.base.container.b567 20-02-09 20:26:29 [ DEBUG]: Calling docker exec -u root b5677e7808fb57bf5b6e6a329b6df5179f04f7d5d2c5506f967eb5923540c08d rm -f /etc/timezone /etc/localtime
19049 docker.base 20-02-09 20:26:29 [ INFO]: Running command: docker cp /etc/timezone b5677e7808fb57bf5b6e6a329b6df5179f04f7d5d2c5506f967eb5923540c08d:/etc/timezone
19049 docker.base 20-02-09 20:26:30 [ INFO]: Running command: docker cp /etc/localtime b5677e7808fb57bf5b6e6a329b6df5179f04f7d5d2c5506f967eb5923540c08d:/etc/localtime
19049 actions.configure 20-02-09 20:26:32 [ DEBUG]: Calling configure
19049 actions.configure.progress 20-02-09 20:26:32 [ DEBUG]: 0
19049 actions.configure 20-02-09 20:26:32 [ INFO]: Configuring 4.3/kopano-meet=1.2.1_0-2
19049 settings 20-02-09 20:26:32 [ INFO]: Unsetting kopano/docker/TURN_USER
19049 settings 20-02-09 20:26:32 [ INFO]: Setting kopano/docker/FQDN_MEET to 'domain.anonymized'
19049 settings 20-02-09 20:26:32 [ INFO]: Setting kopano/docker/FQDN_SSO to 'ucs-sso.domain.anonymized'
19049 actions.configure 20-02-09 20:26:32 [CRITICAL]: Failed to configure: Kopano Meet: kopano/docker/INSECURE: None is not a valid option
19049 actions.configure.progress 20-02-09 20:26:32 [ DEBUG]: 100
19049 packages 20-02-09 20:26:32 [ DEBUG]: Releasing LOCK
19049 actions.upgrade 20-02-09 20:26:32 [CRITICAL]: Failed to configure: Kopano Meet: kopano/docker/INSECURE: None is not a valid option
19049 actions.upgrade 20-02-09 20:26:32 [ WARNING]: Aborting...
19049 utils 20-02-09 20:26:32 [ DEBUG]: send_information: action=upgrade app=kopano-meet value=None status=413
19049 utils 20-02-09 20:26:32 [ DEBUG]: tracking information: {'status': 413, 'uuid': 'e3b9c70c-8cef-4dc8-8c13-51b9becbdcf3', 'app': u'kopano-meet', 'version': u'1.2.1_0-2', 'role': 'domaincontroller_master', 'action': 'upgrade', 'system-uuid': '49d7bf26-4a01-49f6-a3e0-e3ca75c0203e'}
19049 actions.upgrade-search 20-02-09 20:26:32 [ DEBUG]: Calling upgrade-search
19049 actions.upgrade-search.progress 20-02-09 20:26:32 [ DEBUG]: 0
19049 actions.upgrade-search 20-02-09 20:26:32 [ DEBUG]: Checking 4.3/kopano-meet=1.2.1_0-2
19049 actions.upgrade-search 20-02-09 20:26:32 [ INFO]: Executing interface update_available for kopano-meet
19049 actions.upgrade-search 20-02-09 20:26:32 [ INFO]: No interface defined