Hey all,
I was facing the same problem. On researching long, I found reason for the 
cancellation of upgrade was the presence of broken packages. These packages 
were of ROS as well as of some other softwares. So simply remove those broken 
packages and then try to upgrade your OS. It will work.

Thanks,
Shahbaz

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https://bugs.launchpad.net/bugs/1611737

Title:
  Can't upgrade from a release if ros packages are  installed from ROS
  servers

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