Command "upgrade" is not defined! Problem

🚧 Installation
#1

I always gets this error. I wanted to migrate from OwnCloud to NextCloud.

Here the code:

root@BANANAS ~www/nextcloud # sudo -u www-data php occ upgrade

Nextcloud is not installed - only a limited number of commands are available

[Symfony\Component\Console\Exception\CommandNotFoundException]
Command “upgrade” is not defined.

Who can help me fast? I need my calender.

#2

Please check if you installed all required modules:
https://docs.nextcloud.com/server/9/admin_manual/installation/source_installation.html#prerequisites

The ownCloud setup is running on your machine (then normally the php config should be quite ok)? Between which version are you updating?