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

[Maarten Lankhorst]

Downgrading is trivial: apt-get install xserver-xorg-lts-precise
libgl1-mesa-{dri,glx}:i386

This is unsupported for newer hardware, because they're not tested with
the older linux/xserver, but in your case it would work. It seems some
interaction with multiarch is making it fail. Multiarch was already
failing to switch correctly, causing the 32-bits libs to be uninstalled.
If I install enough 32-bits applications I can make it uninstall
kubuntu-desktop too.

But the failure the other way around is easier to test:

pbuilder-dist precise amd64 login
apt-get install --install-recommends ia32-libs xserver-xorg-lts-precise
apt-get install --install-recommends xserver-xorg-lts-quantal

Notice that ia32-libs gets removed by installing xserver-xorg-lts-quantal. However if I install ia32-libs afterwards it works, because that case was fixed in #1130419:
pbuilder-dist precise amd64 login
apt-get install --install-recommends xserver-xorg-lts-quantal
apt-get install --install-recommends ia32-libs

It's still easy to make the resolver die completely, too:

pbuilder-dist precise amd64 login
apt-get install --install-recommends xserver-xorg-lts-precise
apt-get install --install-recommends xserver-xorg-lts-quantal ia32-libs

if you add libgl1-mesa-{glx,dri}-lts-quantal:i386 to the last line, it
will find the correct solution.

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

Title:
  xserver-xorg-lts-quantal breaks Kubuntu

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