Integration of collabora in nextcloud

Hi,
I’m a beginner of univention, but I think it’s a fantastic project.

I’ve created a VM with UCS. I’ve installed Nextcloud and the Collabora Online Development Edition. I’d like to execute the followinf command on the UCS Server cat /etc/univention/ssl/ucsCA/CAcert.pem |
docker exec -i “$(ucr get appcenter/apps/nextcloud/container)”
bash -c ‘cat >> var/www/html/resources/config/ca-bundle.crt’
but terminal return bash: ucr: command not found.

How to fix the problem and integrate collabora in nextcloud???

Thanks a lot

Solved!!! I run the command as root and it works

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