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[Doug McMahon <1429529@xxxxxxxxxxxxxxxxxx>]

And possibly - 
https://bugs.launchpad.net/ubuntu/+source/unity-control-center/+bug/1428972

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

Title:
  Unsolvable LTSEnablementStack Mesa package dependency

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

Bug description:
  [Description]
  On 14.04.2 aptitude/APT determinates non-LTSEnablementStack Mesa packages instead of *lts-utopic pendants as dependencies. This leads to unsolvable conflicts with the already installed *lts-utopic packages.

  
  [Test Case]
  [a] libgles2-mesa (10.1.3-0ubuntu0.3) instead of libgles2-mesa-lts-utopic (10.3.2-0ubuntu1~trusty2)
  $ sudo aptitude install qtbase5-dev
  The following NEW packages will be installed:
    libglapi-mesa{a} libgles2-mesa{ab} libgles2-mesa-dev{a} libglu1-mesa-dev{a} libqt5concurrent5{a} libqt5opengl5-dev{a} qt5-qmake{a} 
    qtbase5-dev qtbase5-dev-tools{a} 
  0 packages upgraded, 9 newly installed, 0 to remove and 0 not upgraded.
  Need to get 4,439 kB of archives. After unpacking 27.9 MB will be used.
  The following packages have unmet dependencies:
   xserver-xorg-lts-utopic : Conflicts: libglapi-mesa (>= 0~) but 10.1.3-0ubuntu0.3 is to be installed.
                             Conflicts: libgles2-mesa (>= 0~) but 10.1.3-0ubuntu0.3 is to be installed.
   libgles2-mesa : Conflicts: libgles2 which is a virtual package.
   libglapi-mesa-lts-utopic : Conflicts: libglapi-mesa but 10.1.3-0ubuntu0.3 is to be installed.
   libgles2-mesa-lts-utopic : Conflicts: libgles2 which is a virtual package.
                              Conflicts: libgles2-mesa but 10.1.3-0ubuntu0.3 is to be installed.

  libglapi-mesa conflicts due to libgles2-mesa having a dependency on
  libglapi-mesa (= 10.1.3-0ubuntu0.3).

  [b] libgl1-mesa-dev (10.1.3-0ubuntu0.3) instead of libgl1-mesa-lts-utopic (10.3.2-0ubuntu1~trusty2)
  $ sudo aptitude install freeglut3-dev
  The following NEW packages will be installed:
    freeglut3{a} freeglut3-dev libdrm-dev{a} libgl1-mesa-dev{a} libgl1-mesa-dri{a} libgl1-mesa-glx{ab} libglapi-mesa{a} libglu1-mesa-dev{a} 
    libice-dev{a} libllvm3.4{a} libpthread-stubs0-dev{a} libsm-dev{a} libx11-dev{a} libx11-doc{a} libx11-xcb-dev{a} libxau-dev{a} 
    libxcb-dri2-0-dev{a} libxcb-dri3-dev{a} libxcb-glx0-dev{a} libxcb-present-dev{a} libxcb-randr0-dev{a} libxcb-render0-dev{a} 
    libxcb-shape0-dev{a} libxcb-sync-dev{a} libxcb-xfixes0-dev{a} libxcb1-dev{a} libxdamage-dev{a} libxdmcp-dev{a} libxext-dev{a} 
    libxfixes-dev{a} libxshmfence-dev{a} libxt-dev{a} libxxf86vm-dev{a} mesa-common-dev{a} x11proto-core-dev{a} x11proto-damage-dev{a} 
    x11proto-dri2-dev{a} x11proto-fixes-dev{a} x11proto-gl-dev{a} x11proto-input-dev{a} x11proto-kb-dev{a} x11proto-xext-dev{a} 
    x11proto-xf86vidmode-dev{a} xorg-sgml-doctools{a} xtrans-dev{a} 
  0 packages upgraded, 45 newly installed, 0 to remove and 68 not upgraded.
  Need to get 16.6 MB of archives. After unpacking 88.2 MB will be used.
  The following packages have unmet dependencies:
   libgl1-mesa-dri-lts-utopic : Conflicts: libgl1-mesa-dri but 10.1.3-0ubuntu0.3 is to be installed.
   libgl1-mesa-glx-lts-utopic : Conflicts: libgl1 which is a virtual package.
                                Conflicts: libgl1-mesa-glx but 10.1.3-0ubuntu0.3 is to be installed.
   xserver-xorg-lts-utopic : Conflicts: libgl1-mesa-dri (>= 0~) but 10.1.3-0ubuntu0.3 is to be installed.
                             Conflicts: libgl1-mesa-glx (>= 0~) but 10.1.3-0ubuntu0.3 is to be installed.
                             Conflicts: libglapi-mesa (>= 0~) but 10.1.3-0ubuntu0.3 is to be installed.
   libgl1-mesa-glx : Conflicts: libgl1 which is a virtual package.
   libglapi-mesa-lts-utopic : Conflicts: libglapi-mesa but 10.1.3-0ubuntu0.3 is to be installed.

  [Workaround]
  [a]
  $ sudo aptitude install qtbase5-dev libgles2-mesa-lts-utopic

  [b]
  $ sudo aptitude install -s freeglut3-dev libgl1-mesa-dev-lts-utopic

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