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[Timo Jyrinki <timo.jyrinki@xxxxxxxxxxxxx>]

I'm not aware of what could be done on the Qt side, as it's related to
the 14.04.X LTS HWE upgrades where X >= 2. The upgrade is complex and
some of the mesa packages have seen slight changes (in addition to being
just -lts-vivid suffixed).

It's not as qtbase5-dev could not be installed as such, it's that apt
needs to be hinted additionally with eg that libgles2-mesa-dev for the
install to succeed. So apt could handle the situation better, or
something could maybe improved in the HWE packages.

** Package changed: xorg-lts-vivid (Ubuntu) => mesa-lts-vivid (Ubuntu)

** Also affects: apt (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: qtbase-opensource-src (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1435324

Title:
  qtbase5-dev not installable on Ubuntu 14.04 LTS

Status in apt package in Ubuntu:
  New
Status in mesa-lts-vivid package in Ubuntu:
  New
Status in qtbase-opensource-src package in Ubuntu:
  Incomplete

Bug description:
  I discovered the problem when I tried to compile a Qt5 QML program firstly.
  I have an Ubuntu 14.04.2 LTS with all updates, no significant PPAs (only nodejs and owncloud, not affecting this problem here) and with all the -lts-utopic upgrade packages installed.

  With that system, I tried to install qtbase5-dev, and apt told me:

  [...]
  The following packages have unmet dependencies:
   qtbase5-dev : Depends: libgles2-mesa-dev or
                          libgles2-dev but it is not installable
   unity-control-center : Depends: libcheese-gtk23 (>= 3.4.0) but it is not going to be installed
                          Depends: libcheese7 (>= 3.0.1) but it is not going to be installed
  E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

  So this package seems to be not installable. This tried in synaptic,
  it tries to uninstall all -lts-utopic packages (inclusive all
  xserver*.deb) and install the "old" ones instead of them.

  So the problem somewhere lies within the new lts packages that seem
  not to be compatible with qtbase5-dev (and its dependency: libgles2
  -mesa-dev - but I am not able to find out further.

  The problem is: Qt5 development on an Ubuntu 14.04.2 LTS machine is
  NOT possible without a fix. The make process always complains about
  not finding gl libraries.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: qtbase5-dev (not installed)
  ProcVersionSignature: Ubuntu 3.16.0-31.43~14.04.1-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Mar 23 14:01:20 2015
  InstallationDate: Installed on 2015-02-25 (26 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: qtbase-opensource-src
  UpgradeStatus: No upgrade log present (probably fresh install)

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