The upgrade calculation has failed due to the fact that you have a
version of python3.9 installed from a PPA which provides a package
version number greater than the release to which you are trying to
upgrade. You'll need to remove the deadsnakes PPA using the tool 'ppa-
purge' from the package 'ppa-purge' for the upgrade to be calculable.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1958687
Title:
ubuntu upgrader core
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