When trying to upgrade to NC18.0.1 I get the follwing log / error message
Running nc-update-nextcloud
Current Nextcloud version 17.0.2.1
Available Nextcloud version 18.0.1
Download Nextcloud 18.0.1...
Back up current instance...
check free space...
Maintenance mode enabled
backup database...
backup files...
backup /var/www//nextcloud-bkp_20200315_1584287334.tar.gz generated
Maintenance mode disabled
Install Nextcloud 18.0.1...
Restore apps...
* calendar
* contacts
* files_texteditor
* gallery
* news
* nextcloudpi
* notes
* previewgenerator
* previewgenerator.orig
* tasks
Fix permissions...
Upgrade...
Nextcloud is not installed - only a limited number of commands are available
Command "upgrade" is not defined.
Abort
Runnning system is running without problems behind Traefik reverse proxy on port 8443.