*** This bug is a duplicate of bug 1889250 ***
https://bugs.launchpad.net/bugs/1889250
** This bug has been marked a duplicate of bug 1889250
Unable to calculate the upgrade to 20.04 due to nodejs from nodesource
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Bug
Reviewing the files from your upgrade attempt you have installed nodejs
from a location other than the offical Ubuntu archive. This version of
nodejs is greater than the one in the official archive and is keeping
some python packages installed which then prevents the upgrade from
being calculated.