[Bug 1556346] Re: Should not allow impossible release upgrades

[Doug McMahon]

Sure - as it happens I was just putting in a new 14.04.3 install when email arrived so - 
Upgraded the install
Opened up software properties & set it to Notify me  'For any new version'

A bit later update-manager? notified me of a distribution upgrade so went ahead with it, ie. an upgrade to 15.10
It proceeded along until about 1/3 of the way thru installing packages, crashed to a black screen & no longer can be booted to.
I can access any logs & attach, the /var/log/dist-upgrade/*.logs may be appropriate, the apt.log is  92 kB, the apt-term.log is 376kB, the main.log is only 46kB. Do you want them & if so should I compress?
Will attach a few screens

** Attachment added: "Screenshot from 2016-03-23 19:11:07.png"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1556346/+attachment/4609109/+files/Screenshot%20from%202016-03-23%2019%3A11%3A07.png

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https://bugs.launchpad.net/bugs/1556346

Title:
  Should not allow impossible release upgrades

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  For example now in 14.04 it will show & will attempt a 14.04 to 15.10 upgrade. This upgrade is impossible & the attempt will result in a destroyed 14.04 install.
  The app should not show this upgrade let alone allow it to be done (not  actually 'done'  as it will fail hard during the install phase.

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