I have same same problem, and I'm attaching apt.log in case this can
help tracking down this bug.
** Attachment added: "apt.log after failed upgrade"
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1241420/+attachment/3881995/+files/apt.log
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** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1241420
Title:
Unable to upgrade to 13.10 ( Could not calculate the upgr
