Looks like you have some custom PPA's installed. You will need to remove them
and their packages to proceed with update. Consider using the command line
tool 'ppa-purge'. Closing report since its not a bug. Opening answer request.
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** Changed in: update-manager (Ubuntu)
Status: New => Invalid
** Converted to question:
https://answers.launchpad.net/ubuntu/+source/update-manager/+question/177221
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https://bugs.launchpad.net/bugs/879590
Title:
Upgrade from 11.04 to 11.10 fails with "Could not calculate the
upgrade" message
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