[Bug 989238] [NEW] distupgrade fails if update-altertives used to the set python to currect version

[michael]

Public bug reported:

I have added pyton to update-altertives to switch between version as a
result /usr/bin/python always points to /etc/alternatives/python.
DistUpgradeController.py refuses to allow the upgrade even if
/etc/alternatives/python points to the correct version of python. The
attatched patch will verrify the correct verision is set in this
scenario as while still failing for other unexpected changes. It will
also fail if a non-default python version is in use via update-
alternatives which can cause strange issues.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: dist-upgrade

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https://bugs.launchpad.net/bugs/989238

Title:
  distupgrade fails if update-altertives used to the set python to
  currect version

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  I have added pyton to update-altertives to switch between version as a
  result /usr/bin/python always points to /etc/alternatives/python.
  DistUpgradeController.py refuses to allow the upgrade even if
  /etc/alternatives/python points to the correct version of python. The
  attatched patch will verrify the correct verision is set in this
  scenario as while still failing for other unexpected changes. It will
  also fail if a non-default python version is in use via update-
  alternatives which can cause strange issues.

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