Installation of Nextcloud 20.0.10-0 fails on UCS 5.0-0 errata32

Hello,
After spending some time on installing and reinstalling Univention 5.0 on Proxmox here is what I get.
Fresh install. Running and reachable from LAN and WAN through https:// with letsencrypt (2.0.0-1).

Trying to install Nextcloud gives me:

Installation of Nextcloud Hub
We tried to do as requested but failed for nextcloud on my.dom.aine
These are the error messages from the server. More information might be available on the system's logfile /var/log/univention/appcenter.log

/var/log/univention/appcenter.log says:

  9668 actions.install                  21-06-27 18:33:02 [    INFO]: Downloading app image docker.software-univention.de/nextcloud:20.0.10-0
  9668 docker                           21-06-27 18:33:17 [ WARNING]: Could not login to docker.software-univention.de. You may not be able to pull the image from the repository!
  9668 docker                           21-06-27 18:33:17 [    INFO]: Running command: docker pull docker.software-univention.de/nextcloud:20.0.10-0
  9668 docker                           21-06-27 18:33:33 [    INFO]: Error response from daemon: Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
  9668 docker                           21-06-27 18:33:33 [   ERROR]: Command docker pull docker.software-univention.de/nextcloud:20.0.10-0 failed with: Error response from daemon: Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers) (1)
  9668 packages                         21-06-27 18:33:33 [   DEBUG]: Releasing LOCK
  9668 actions.install                  21-06-27 18:33:33 [CRITICAL]: Downloading Docker image docker.software-univention.de/nextcloud:20.0.10-0 failed: Error response from daemon: Get https://docker.software-univention.de/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

  9668 actions.install                  21-06-27 18:33:33 [ WARNING]: Aborting...

then notification:

Notifications

Notification

Not all installed components have been registered. Please visit the ["Domain join" module] to register the remaining components.

here a job is pending:
51nextcloud-uninstall ...pending
neighter Execute nor Force Execute changes anything.

Did anyone experience the same probleme?
Greetings
Jakob

PS: While installing Let’s Encrypt Certificate there something not clear to as well:

3. Once the certificate has been configured, you need to restart the desired services via the "System services" module in the UMC. This is only required during setup. The automatic renewal mechanism restarts the services if needed.
If you want to change the hostname in the certificate later on, just change the configuration in the App Settings and save.

Which are the desired services? -> apache2 ? Not knowing I just restarted the server. I did as well a update-ca-certificates as root in command.

Hello @mangrovenjazz,

due to maintenance on the infrastructure over the weekend, the Docker registry was not available and therefore the installation failed. Please try again. The registry is back available.

Best regards,
Nico

Hi @gulden,
Worked like it should work. I was persuaded that maintenance was announced as finished on friday 25.06.2021. There just some minor bugs about the display of the portal (or I didn’t get the management of it). Thanks for your help.
Regards
Jakob

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