I'm following these instructions on how to install Indigo: http://wiki.ros.org/indigo/Installation/Ubuntu
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
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. I've already asked on ROS Answers but received no answer, and the technician in charge of the computer lab I'm working in hasn't yet found a solution, so... help me stack exchange, you're my only hope.
P.S. I'm assuming that this question goes in the robotics section because it's related to ROS, but if this belongs in the Ubuntu or main stack overflow section please let me know.
Edit: things I have tried so far
sudo apt-get update and
sudo apt-get upgrade, changed nothing.
2. When I type in
apt-cache libgl1-mesa-dev-lts-utopic I get
E: Invalid operation libgl1-mesa-dev-lts-utopic
3. When I type in
apt-cache search libgl1-mesa-dev-lts-utopic I get no output.
4. When I type in
ls /etc/apt/sources.list.d I get