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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/777350 Title: Could not calculate the upgrade 10.10 -> 11.4 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs