Can't upgrade from 18.04.5 LTS to 20.04 LTS - "Could not calculate the upgrade"

[laurin01]

This bug also doesn't just affect me, there are multiple other people that have the same problem:
https://bugs.launchpad.net/ubuntu/+s...by=-id&start=0
However, it doesn't seem like there's a fix for this problem yet.

[laurin01]

After manually removing all software from external sources, I still had 182 packages marked as broken. I researched further and found that 16 of these also couldn't be reinstalled. In the end, removing gqrx-sdr and gnuradio solved the problem, I think that gnuradio was the culprit. After doing so I was able to successfully upgrade to 20.04.1 LTS.

[alpha233]

After manually removing all software from external sources, I still had 182 packages marked as broken. I researched further and found that 16 of these also couldn't be reinstalled. In the end, removing gqrx-sdr and gnuradio solved the problem, I think that gnuradio was the culprit. After doing so I was able to successfully upgrade to 20.04.1 LTS.

Same issue, I have both gqrx-sdr and gnuradio. 'sudo apt-get remove gnuradio' alone resolved the issue and allowed the upgrade to 20.04.1 LTS. Thank you for your comment; it saved me significant time researching.