Hey @TimoG! Welcome to the n8n community!
So, as it turns out, I am running into the exact same problem. I’ve seen this on both an Ubuntu 18.04 and the more recent Ubuntu 20.04. But, there are some differences which may lead us in the right direction.
Where you are using the docker installation, I did a clean Ubuntu install with the following:
- NPM 6.14.4
- NodeJS 12.17.0
- n8n 0.67.3
I am also running n8n using the PM2 service so that it runs automatically when the server launches without me needing to log in. I did the installation with a variation of my n8n-pi installation script that I am building for Debian/Ubuntu systems.
When I connect into the webUI, I get this:
Note the highlighted area in the top right corner.
I’m now starting to troubleshoot some of this and I think it is actually a networking thing as I’ve also seen this when I use a VPN. I’ll update this post as I discover what is and what is not a part of the issue and also how I resolved the problem.