Public bug reported:

# Impact
DistUpgradeFetcherKDE.py calls self._warning() but in fact _warning is not an 
instance method of the fetcher but rather a global helper. This causes early 
unhandled exceptions entirely defuncing the fetcher rendering upgrades with the 
KDE UI impossible.

This was fixed in https://launchpad.net/ubuntu/+source/ubuntu-release-
upgrader/1:15.10.4 and needs to be SRU'd into vivid as it also suffers
from the problem.

# Test Case
- run `kdesudo -- do-release-upgrade -m desktop -f DistUpgradeViewKDE`
- should come up with installer

# Regression Potential
None. Fetcher currently crashes 10/10 times

# Other Info
In testing I didn't actually get the fetcher UI itself to display, so I expect 
there is more wrong. It would however be a good start to not have it crash.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Critical
         Status: Fix Released

** Affects: ubuntu-release-upgrader (Ubuntu Vivid)
     Importance: Critical
         Status: Triaged

** Also affects: ubuntu-release-upgrader (Ubuntu Vivid)
   Importance: Undecided
       Status: New

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

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

** Changed in: ubuntu-release-upgrader (Ubuntu Vivid)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1507886

Title:
  DistUpgradeFetcherKDE crashes on method _warning

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