Thank you for the hints, Brian!

There are some things I noticed which may have lead to the error:

- I had packages installed from 20.04 already
- packages from bionic were pinned to lower priority

The upgrade succeeded after removing the pin.

This issue can be closed I guess.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1921593

Title:
  do-release-upgrade fails with no error

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