SHELL

pip install turtle

pip install PythonTurtle

install turtle command

$ pip install turtle

pip install turtle

$ pip install PythonTurtle

pip install turtle

Ubuntu Linux:

$ sudo apt-get install -y python3-wxgtk4.0

Fedora (I tried the command below on my Ubuntu linux and it worked):

$ python3 -m pip install wxpython

On any GNU/Linux distribution: (after installing prerequisites from above)

$ python3 -m pip install --user PythonTurtle
$ PythonTurtle