Issue was not being able to import a video into Peertube using a URL.
Peertube was set up to use youtube-dl which is in /var/www/peertube/storage/bin/youtube-dl. Further investigation showed that Peertube calls it with python.
python youtube-dl video-to-download
Usually Python refers to Python 2 where as Python3 refers to Python 3.
We can create a symlink so that python = python3
sudo ln -s /usr/bin/python3 /usr/bin/python
This way when Peertube runs python, it technically will run it with python3.
Note you will probably run into issues if you do have Python 2 installed and need it. In my case, python was not installed and didn’t reference anything.