Thanks for your report.
Could you please revert python2.7 to the version from the official
Ubuntu repository and try again. Thanks.
I'm closing this report because it is not a bug in Ubuntu. Don't
hesitate to submit any new bug.
** Changed in: update-manager (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/777350
Title:
Could not calculate the upgrade 10.10 -> 11.4
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