Cannot figure out what's going on with python3-rosdep2

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I'm following the instructions for installing ROS2 here and I keep getting the error

sudo: rosdep: command not found

when I run sudo update init. Looking through the files installed in the package python3-rosdep2, I don't see any executable. I tried sudo python3 -m rosdep2 init and it says

/usr/bin/python3: No module named rosdep2.__main__; 'rosdep2' is a package and cannot be directly executed

So I have no idea what to do next. I created an issue on github and was told to ask my question here. After following the instructions given on github I still cannot execute the steps to install and use python3-rosdep2.