sudo apt-get install libgl1-mesa-dev-lts-utopic                                                                                                     │·····
Reading package lists... Done                                                                                                                                     │·····
Building dependency tree                                                                                                                                          │·····
Reading state information... Done                                                                                                                                 │·····
Some packages could not be installed. This may mean that you have                                                                                                 │·····
requested an impossible situation or if you are using the unstable                                                                                                │·····
distribution that some required packages have not yet been created                                                                                                │·····
or been moved out of Incoming.                                                                                                                                    │·····
The following information may help to resolve the situation:                                                                                                      │·····
                                                                                                                                                                  │·····
The following packages have unmet dependencies:                                                                                                                   │·····
 libgl1-mesa-dev-lts-utopic : Depends: mesa-common-dev-lts-utopic (= 10.3.2-0ubuntu1~trusty2) but it is not going to be installed                                 │·····
                              Depends: libgl1-mesa-glx-lts-utopic (= 10.3.2-0ubuntu1~trusty2) but it is not going to be installed                                 │·····
 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.