I just got FRCsim working on my Linux Mint PC. The install script warns you that distributions other than Ubuntu are not supported, but I suspected that it would work fine on most Debian bassed distros. I made these changes to the install script so it will atleast finish running on any linux distro, though FRCsim might fail on some still.
change line 92 to
if ! echo "deb http://packages.osrfoundation.org/gazebo/ubuntu trusty main" > /etc/apt/sources.list.d/gazebo-latest.list
and line 107 to
if ! echo "deb http://first.wpi.edu/FRC/roborio/release/linux trusty main" > /etc/apt/sources.list.d/frcsim-latest.list
This just grabs the repositories for Ubuntu. Instead of trying to find the repo for your distribution
Have fun!