Do I need to uninstall ROS (raspberry pi 3)?

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Hi all -

So, I installed ROS on my pi recently following the installation tutorial. Installation was successful and I can use ROS to print hello and post topics (verified).

When I attempt to run:

sudo apt-get install ros-indigo-ros-tutorials

I get the error E: Unable to locate package ros-indigo-ros-tutorials

I figure this is because I installed the the wrong packages using the ROS-Comm build that doesn't support GUI tools. I believe I should of used the Desktop build to get package support for things like turtlesim. So, I tried to re-install Desktop over my existing ROS-Comm version, but with no success.

1) Is my assumption correct and the reason I'm getting the "unable to locate package" error due to having installed the wrong version of indigo?

2) Must I completely uninstall ROS and start over, or is there another way to do this by removing certain packages before attempting to recompile?

Thanks all.