I just had a problem that looked similar to yours, i.e. seeing: KeyError: "The cache has no package named 'linux-generic-lts-utopic'
I had upgraded from 14.04 to 15.04, and then wanted to go to 15.10. It seems that certain xserver/nvidia packages had been kept at trusty. I removed them, and then it prompted to install the vivid versions (although they were older). Unfortunately that led to a situation where I couldn't boot X as the kernel headers were not installed. Anyway, everything now working, perhaps, at 15.04. But upgrade still fails. Stuck at calculating changes. My apt.log file is attached. ** Attachment added: "apt.log" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1515316/+attachment/4517316/+files/apt.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1515316 Title: distro upgrade bug To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1515316/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
