Trying to install ROS Indigo, unmet dependencies [closed]

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I'm following these instructions on how to install Indigo: http://wiki.ros.org/indigo/Installati...

When I enter the command: sudo apt-get install ros-indigo-desktop-full I get the following output:

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:

ros-indigo-desktop-full :  
Depends: ros-indigo-desktop but it is not going to be installed  
Depends: ros-indigo-perception but it is not going to be installed  
Depends: ros-indigo-simulators but it is not going to be installed  
Depends: ros-indigo-urdf-tutorial 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.

According to the instructions I am following, unmet dependencies should be solved with either the command

sudo apt-get install xserver-xorg-dev-lts-utopic mesa-common-dev-lts-utopic libxatracker-dev-lts-utopic libopenvg1-mesa-dev-lts-utopic libgles2-mesa-dev-lts-utopic libgles1-mesa-dev-lts-utopic libgl1-mesa-dev-lts-utopic libgbm-dev-lts-utopic libegl1-mesa-dev-lts-utopic

or

sudo apt-get install libgl1-mesa-dev-lts-utopic

However when I try to use these commands I get unable to locate package errors such as

E: Unable to locate package libgl1-mesa-dev-lts-utopic

I'd appreciate any advice on how to solve these dependency issues.