I just noticed that the debugging info above suggests I updated to Saucy yesterday. This is incorrect. Looking at my apt logs, I have installed Saucy back in October 2013.
In case it is relevant, I have changed computers since. My current spindle (an SSD) was in my old notebook computer which developed intermittent hardware faults so I purchased a new notebook in March this year and simply moved the SSD into the new notebook. Perhaps this (or the intermittent hardware faults) have contributed to/caused my current upgrade problem? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1314739 Title: Unable to upgrade from 13.10 to 14.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1314739/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs