[Bug 1134492] Re: xserver-xorg-lts-quantal breaks Kubuntu

[David Kalnischkies]

General:
Limiting a solution to Conflicts would be bad, that should work with Breaks too, as Conflicts should be avoided like the plague (if we can). And just doing it on Conflicts (or Breaks) does make it apply to a lot of cases there we don't want it to happen (think: libfoogtk2-0 conflicts/breaks with libfoogtk3-0) so we need some more heuristic here than just this (aspcud is just based on numbers, so it works here, but fails then the solution is not just a numbers game).

I can only really comment on that with an example though (a dpkg/status
file and sources.list might be enough until a test surfaces. Setting up
a system to test just this isn't exactly easy …). Frankly, I don't see
why this is considered "high" though: switching X-stacks doesn't sound
like an everyday task, so I guess everyone could live with a slightly
longer commandline to type (aka: copy&paste) and a "low" or similar…


Quick-Review (just looking at diff, no applied or anything)
1. A user can easily have more architectures configured than just two, so comparing architectures is dangerous.
2. Not all of these architectures are a good choice (think: armel on armhf or armhf on a amd64 crossbuilder).
3. Please do a patch against trunk. We can always try to backport it later.
4. MarkInstall (and for that matter MarkDelete) can fail and you should do something sensible if they do, not just ignore it
5. Do we really want to do something even if the removed package is M-A:foreign ?

Serious nitpick: Don't name a variable iPkg if you use Pkg in the same
context, while its definition is far away. It's very easy to miss (which
I did initially and wondered why you renamed Pkg to iPkg and wanted to
nitpick about unneeded renames first…)

Lesser nitpick: Instead of Z, use P as an iterator. If you are used to
APT code you know immediately which iterators are G, P, V, D, … no such
hint for Z (okay, at times P stands for Provides, but every rule has an
exception – and usually its Prv instead).

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https://bugs.launchpad.net/bugs/1134492

Title:
  xserver-xorg-lts-quantal breaks Kubuntu

Status in “apt” package in Ubuntu:
  Confirmed
Status in “xorg-lts-quantal” package in Ubuntu:
  Invalid

Bug description:
  Installing xserver-xorg-lts-quantal as suggested on
  https://wiki.ubuntu.com/Kernel/LTSEnablementStack breaks Kubuntu 12.04
  as crucial KDE packages like kubuntu-desktop, kdm etc. will be
  removed.

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