This is probably because you've installed gcc-10 packages from an
archive other than the official Ubuntu one. From
VarLogDistUpgradeAptclonesystemstate.tar.gz:
gcc-10-base 10-20200411-1 1
Removing that package and any other ones with the same version may allow
you to complete the upgrade.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1890161
Title:
Cannot upgrade from 18.04 to 20.04
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