Can't find ros-$ROS_DISTRO-catkin

[garethellis0]

Whenever I try to use this, on sudo apt-get install -y python-catkin-pkg python-rosdep python-wstool ros-$ROS_DISTRO-catkin" I get E: Unable to locate package ros-kinetic-catkin and the corresponding Travis-CI error The command "sudo apt-get install -y python-catkin-pkg python-rosdep python-wstool ros-$ROS_DISTRO-catkin" failed and exited with 100 during .. Any thoughts on what might be going wrong? I tried replacing the commands with those from the kinetic wiki but got the same error