Hi stegan,
Make sure you do “cd” into the “/usr/local/lib/owncloud” and then execute the command:
root@box:/usr/local/lib/owncloud# sudo -H -u www-data php occ -V Nextcloud version 12.0.3
Some other usefule directories and files that you may check as well:
/home/user-data/owncloud-backup /home/user-data/owncloud /home/user-data/owncloud/owncloud.db /home/deploy/mailinabox/setup/owncloud.sh /home/deploy/mailinabox/tools/owncloud-restore.sh /home/deploy/mailinabox/tools/owncloud-unlockadmin.sh /usr/local/lib/owncloud
Cheers,
Martin