I don't claim to be an expert, but if possible, remove gnuradio (and
gnuradio-dev) and reinstall it after upgrade. That's what looks to be
causing the cascade of errors in your apt log.
Let me/us know if that works.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1896848
Title:
Upgrade from 18.04 to 20.04: "An unresolvable problem occurred while
calculating the upgrade." apt.log shows hundreds of broken things.
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