Web-Clipper port mismatch

When I try to use Web-Clipper on Chrome my Ubuntu-Desktop I see a port mismatch.
While the Joplin-app uses port 27583, the clipper uses 41148.
I saw similar messages in this forum but did not see a way to fix it.

I installed Joplin from source on Ubuntu 18.04 as there is no ARM64-version available.

Thanks for your help!

You’re running a dev version of the desktop app with a prod version of the clipper, so it can’t work.

Where can I find a dev-version of the clipper?