Comment 3 for bug 1452577

Simulating the install on checkbox-gui with all its dependencies is OK:

~ # in-target apt-get -s install checkbox-gui libgles2-mesa qtdeclarative5-ubuntu-ui-toolkit-plugin libglapi-mesa-lts-utopic libgl1-mesa-glx-lts-utopic
May 7 07:29:34 in-target: Reading state information...
May 7 07:29:34 in-target:
May 7 07:29:34 in-target: The following extra packages will be installed:
May 7 07:29:34 in-target: checkbox-ng checkbox-ng-service dconf-gsettings-backend dconf-service
[...]

Adding ubuntu-desktop seems to introduce some problem:

~ # in-target apt-get -s install checkbox-gui libgles2-mesa qtdeclarative5-ubuntu-ui-toolkit-plugin libglapi-mesa-lts-utopic libgl1-mesa-glx-lts-utopic ubuntu-desktop
May 7 07:30:14 in-target: Building dependency tree...
May 7 07:30:14 in-target:
May 7 07:30:14 in-target: Reading state information...
May 7 07:30:14 in-target:
May 7 07:30:14 in-target: Some packages could not be installed. This may mean that you have
May 7 07:30:14 in-target: requested an impossible situation or if you are using the unstable
May 7 07:30:14 in-target: distribution that some required packages have not yet been created
May 7 07:30:14 in-target: or been moved out of Incoming.
May 7 07:30:14 in-target: The following information may help to resolve the situation:
May 7 07:30:14 in-target:
May 7 07:30:14 in-target: The following packages have unmet dependencies:
May 7 07:30:14 in-target: libgl1-mesa-glx-lts-utopic : Depends: libgl1-mesa-dri-lts-utopic (= 10.3.2-0ubuntu1~trusty2) but it is not going to be installed
May 7 07:30:14 in-target: ubuntu-desktop : Depends: unity-control-center but it is not going to be installed
May 7 07:30:14 in-target: Depends: xorg but it is not going to be installed
May 7 07:30:14 in-target: Recommends: cheese but it is not going to be installed
May 7 07:30:14 in-target: Recommends: empathy but it is not going to be installed
May 7 07:30:14 in-target: Recommends: totem but it is not going to be installed
May 7 07:30:14 in-target: Recommends: totem-mozilla but it is not going to be installed
May 7 07:30:14 in-target: Recommends: xul-ext-webaccounts but it is not going to be installed
May 7 07:30:14 in-target: E
May 7 07:30:14 in-target: :
May 7 07:30:14 in-target: Unable to correct problems, you have held broken packages.