This should be resolved by the following change to ubuntu-release-
upgrader.
ubuntu-release-upgrader (1:20.04.31) focal; urgency=medium
* DistUpgrade/DistUpgradeQuirks.py: use apt's problem resolver to better
calculate upgrades where python is replaced by python-is-python2 thereby
resolving a host of upgrade failures. Thanks to Julian for the initial
patch. (LP: #1898152)
-- Brian Murray <br...@ubuntu.com> Wed, 31 Mar 2021 10:13:14 -0700
** Changed in: ubuntu-release-upgrader (Ubuntu Focal)
Status: Confirmed => Fix Released
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1914827
Title:
18.04 to 20.04 upgrade failed until -dbg packages removed
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