*** This bug is a duplicate of bug 1970018 ***
https://bugs.launchpad.net/bugs/1970018
Reviewing the files from your upgrade attempt, you have installed
packages from the deadsnakes PPA. Some of the packages installed are
newer than those in the official archive, which is keeping some python
packages installed which then prevents the upgrade from being
calculated. Please try using the ppa-purge tool to remove packages
installed from ppa:deadsnakes/ppa. After that you can try upgrading
again and if it still fails open a new bug report. Thanks and good luck!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
** Tags added: deadsnakes-ppa
** This bug has been marked a duplicate of bug 1970018
Cannot upgrade to ubuntu 21.10 from ubuntu 20.04.
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https://bugs.launchpad.net/bugs/2084578
Title:
Could not calculate the upgrade An unresolvable problem occurred
while calculating the upgrade. If none of this applies, then please
report this bug using the command 'ubuntu-bug ubuntu-release-
upgrader-core' in a terminal. If you want to investigate this
yourself the log files in '/var/log/dist-upgrade' will contain
details about the upgrade. Specifically, look at 'main.log' and
'apt.log'. Restoring original system state Aborting Reading
package lists... Done Building dependency tree... Done Reading
state information... Done
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