please advise.
Mail-in-a-Box Version: v69a
Updating system packages…
Installing system packages…
Initializing system random number generator…
Firewall is active and enabled on system startup
Synchronizing state of fail2ban.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable fail2ban
Installing nsd (DNS server)…
Installing Postfix (SMTP server)…
Installing Dovecot (IMAP server)…
Installing OpenDKIM/OpenDMARC…
Installing SpamAssassin…
bayes: synced databases from journal in 0 seconds: 958 unique entries (1048 total entries)
Installing Nginx (web server)…
Installing Roundcube (webmail)…
Installing Nextcloud (contacts/calendar)…
Upgrading Nextcloud — backing up existing installation, configuration, and database to directory to /home/user-data/owncloud-backup/2024-07-22-06:33:23…
Upgrading to Nextcloud version 26.0.13
Nextcloud or one of the apps require upgrade - only a limited number of commands are available
You may use your browser or the occ upgrade command to do the upgrade
Setting log level to debug
Turned on maintenance mode
Updating database schema
Updated database
Disabled incompatible app: calendar
Disabled incompatible app: contacts
Updating …
Updated to 1.9.1
Starting code integrity check…
Finished code integrity check
Update successful
Turned off maintenance mode
Resetting log level
Check indices of the share table.
Check indices of the filecache table.
Check indices of the twofactor_providers table.
Check indices of the login_flow_v2 table.
Check indices of the whats_new table.
Check indices of the cards table.
Check indices of the cards_properties table.
Check indices of the calendarobjects_props table.
Check indices of the schedulingobjects table.
Check indices of the oc_properties table.
Check indices of the oc_jobs table.
Check indices of the oc_direct_edit table.
Check indices of the oc_preferences table.
Check indices of the oc_mounts table.
Check indices of the oc_systemtag_object_mapping table.
Done.
Check primary keys.
Done.
All tables already up to date!
Nextcloud is already latest version
Error: stepping, UNIQUE constraint failed: oc_users_external.uid, oc_users_external.backend (19)
Installing Z-Push (Exchange/ActiveSync server)…
Installing Mail-in-a-Box system management daemon…
Installing Munin (system monitoring)…
FAILED: apt-get -y -o Dpkg::Options::=–force-confdef -o Dpkg::Options::=–force-confnew install munin munin-node libcgi-fast-perl
E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 1197364 (apt-get)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?
root@box:~#