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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