I have my desktop PC (distro: Ubuntu 14.04.3 LTS, kernel: 3.19.0-28-generic) as the Docker host, mostly for development and testing purposes. I pulled the latest official UCS master image from the Docker Hub. The installation was smooth. I upgraded UCS to the latest stable release and updated the packages in the UMC successfully.
My first problem is that for some reason I can't access the App Center in UMC. When I tried to open the App Center, I got an error message telling me to install Docker. So I ran univention-install docker.io in the CLI of the container and ensured it is running (quite funny having Docker running in Docker container, I didn't know it's possible). Still I can't open the App Center - it is now giving me different error message:
I tried to reboot the UCS but it didn't help.
The second problem is that I can't activate the UCS license. I always get this error message after trying the activation:
Any help appreciated!