sudo apt-get install --install-recommends linux-generic-lts-vivid xserver-xorg-core-lts-vivid xserver-xorg-lts-vivid xserver-xorg-video-all-lts-vivid xserver-xorg-input-all-lts-vivid libwayland-egl1-mesa-lts-vivid 
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:
 libwayland-egl1-mesa-lts-vivid : Depends: libegl1-mesa-lts-vivid (= 10.5.2-0ubuntu1~trusty1) but it is not going to be installed
                                  Conflicts: xorg-renamed-package-lts-utopic
 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
 xserver-xorg-core-lts-vivid : Depends: libgbm1-lts-vivid (>= 8.1~0) but it is not going to be installed
                               Recommends: libgl1-mesa-dri-lts-vivid (>= 7.10.2-4) but it is not going to be installed
                               Conflicts: xorg-renamed-package-lts-utopic
 xserver-xorg-input-all-lts-vivid : Depends: xserver-xorg-input-evdev-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-input-vmmouse-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-input-synaptics-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-input-wacom-lts-vivid but it is not going to be installed
 xserver-xorg-lts-vivid : Depends: xserver-xorg-input-evdev-lts-vivid but it is not going to be installed
                          Recommends: libgl1-mesa-dri-lts-vivid but it is not going to be installed
                          Recommends: libgl1-mesa-glx-lts-vivid but it is not going to be installed
                          Recommends: libegl1-mesa-lts-vivid but it is not going to be installed
                          Recommends: libegl1-mesa-drivers-lts-vivid but it is not installable
                          Recommends: libgbm1-lts-vivid but it is not going to be installed
                          Recommends: libgles2-mesa-lts-vivid but it is not going to be installed
                          Recommends: libgles1-mesa-lts-vivid but it is not going to be installed
                          Conflicts: libegl1-mesa (>= 0~)
                          Conflicts: libgl1-mesa-dri (>= 0~)
                          Conflicts: libgl1-mesa-dri:i386 (>= 0~)
                          Conflicts: libgl1-mesa-glx (>= 0~)
                          Conflicts: libgl1-mesa-glx:i386 (>= 0~)
                          Conflicts: libglapi-mesa (>= 0~)
                          Conflicts: libglapi-mesa:i386 (>= 0~)
                          Conflicts: libgles2-mesa (>= 0~)
                          Conflicts: xorg-renamed-package-lts-utopic
 xserver-xorg-video-all-lts-vivid : Depends: xserver-xorg-video-ati-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-cirrus-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-fbdev-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-intel-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-mga-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-neomagic-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-nouveau-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-openchrome-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-savage-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-siliconmotion-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-sisusb-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-tdfx-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-trident-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-vesa-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-vmware-lts-vivid but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.