[Bug 1507885] [NEW] DistUpgradeFetcherKDE crashes on method _warning

[Harald Sitter]

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: Triaged

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https://bugs.launchpad.net/bugs/1507885

Title:
  DistUpgradeFetcherKDE crashes on method _warning

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

Bug description:
  # 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.

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