[Bug 1556346] [NEW] Should not allow impossible release upgrades

[Doug McMahon]

Public bug reported:

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.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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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