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[Adam Collard <adam.collard@xxxxxxxxxxxxx>]

I had this issue and then purged my system of the Intel Linux Graphics
Installer packages, downgrading packages to the latest available in
trusty-updates as appropriate. After doing that I was successfully able
to install 14.04.2 using the Utopic HWE stack.

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https://bugs.launchpad.net/bugs/1429529

Title:
  Package resolver can't find *-lts-utopic package dependencies, aborts

Status in mesa package in Ubuntu:
  Confirmed
Status in mesa-lts-utopic package in Ubuntu:
  Confirmed

Bug description:
  [Description]
  On Ubuntu 14.04.2 with updated kernel and X stack (LTS Enablement Stacks) package resolver fails to find *-lts-utopic package dependencies, aborts.

  [Test case]
  $ sudo apt-get -o debug::pkgproblemresolver=true install qtbase5-dev
  (Log attached as apt.log)

  [Workaround]
  Manually resolve:
  $ sudo apt-get install qtbase5-dev libgles2-mesa-dev-lts-utopic

  Possible catch all solution:
  $ sudo apt-get install .*-dev-lts-utopic

  [Speculation]
  Control file of libgles2-mesa-dev-lts-utopic 10.3.2-0ubuntu1~trusty2 does look right imho:
  http://debian-handbook.info/browse/stable/sect.package-meta-information.html

  Guess APT just get overwhelmed by the possibilies and aborts before
  finding the right one.

  Is there some SAT-solver, which could conform? Aptitude's resolver fails, too.
  Could control files be tweaked to make resolving easier?

  [Possible affected packages]
  Possible all packages which have dependencies on *-mesa-dev for which there's an updated version in the LTS Enablement Stacks.
  Roughly:
  $ apt-cache rdepends .*-mesa-dev

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