Thank you for taking the time to report this issue and helping to make Ubuntu better.
The error message you obtained says "* Unofficial software packages not provided by Ubuntu Please use the tool 'ppa-purge' from the ppa-purge package to remove software from a Launchpad PPA and try the upgrade again." If you check your sources, you have 3rd party packages installed, a 3rd party MATE PPA & https://deb.nodesource.com/node_14.x which provides the package that is at least one of your issues (ie. nodejs 14.17.0-1nodesource1 I would recommend following the advice in the error message provided in your bug description. I've marked this incomplete, as you haven't followed the instructions of the error message; or remove all 3rd party software before allowing upgrade to proceed. ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1929155 Title: i cant upgrade from 18.04 to 20.04.02 "Cannot calculate the upgrade" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1929155/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
