Hi @SPOautos, during an update nextcloud automatically went into Maintenace mode, after the upgrade you have the choice to keep it on or turn it off. But in your case, the upgrade has broken so you need to use a terminal on your physical machine to restart the upgrade of nextcloud.
- Go in a terminal command line.
- done this command( if you have some issues, you have to send them to us:
cd /var/www/html/nextcloud(maybe you nextcloud directory is in other way so go inside your nextcloud directory)
sudo -u www-data php occ upgrade ( this command start the upgrade of your nextcloud )
sudo -u www-data php occ maintenance:repair ( this command will fix some issue you you have it on your nextcloud )
sudo -u www-data php occ maintenance:mode --off ( this command turn off the Maintenance mode ).
See : Using the occ command — Nextcloud latest Administration Manual latest documentation