Thanks for your report.
One of the problem is caused by sunbird which is not in the archive anymore.
Can you try to remove it and retry the upgrade.
If it fails again, could you please attach the new log file
/var/log/dist-upgrade/apt.log
Thanks.
@Jeremy, please file another report. many different causes can generate
this error. Thanks.
** Changed in: update-manager
Status: New => Incomplete
** Also affects: update-manager (Ubuntu)
Importance: Undecided
Status: New
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
** Changed in: update-manager
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/772501
Title:
Upgrade to Natty fails with "could not calculate upgrade"
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