Could you upgrade after removing following packages?
python-dev
python-all-dev
libpython2-dev
python-instant
python2-dev
libpython-all-dev
libboost-python1.65-dev
python-dolfin
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1919068
Title:
Upgrade to 20.04 (from 18.04) fails with error "Could not calculate
the upgrade"
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