At least part of the problem here is that the ubuntu-release-upgrader
has no support for the ubuntukylin-desktop meta package.

>From main.log:

2016-10-12 18:48:07,325 DEBUG /openCache(), new cache size 75232
2016-10-12 18:48:07,326 DEBUG need_server_mode(): can not find a desktop meta 
package or key deps, running in server mode
2016-10-12 18:48:07,326 DEBUG checkViewDepends()

And from ubuntu-release-upgrader's DistUpgrade.cfg.trusty:

 10 # Distro contains global information about the upgrade
 11 [Distro]
 12 # the meta-pkgs we support
 13 MetaPkgs=ubuntu-desktop, kubuntu-desktop, xubuntu-core,
 14    xubuntu-desktop, ubuntustudio-desktop, mythbuntu-desktop,
 15    kubuntu-netbook, lubuntu-core, lubuntu-desktop, ubuntu-gnome-desktop,
 16    ubuntu-mate-core, ubuntu-mate-cloudtop, ubuntu-mate-desktop


** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Triaged

** Summary changed:

- ubuntu 14.04 upgrade to 16.04 An unresolvable problem occurred while 
calculating the upgrade.
+ ubuntu-release-upgrader doesn't recognize ubuntukylin-desktop as a metapkg

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https://bugs.launchpad.net/bugs/1632665

Title:
  ubuntu-release-upgrader doesn't recognize ubuntukylin-desktop as a
  metapkg

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