You must have any other libraries installed in the same virtual
environment or the default, that causes conflict with 'ursina'
Try store the libraries u use in the project in a new empty virtual environment
1, Install https://pypi.org/project/virtualenv/
pip install virtualenv
2, Create a new folder for your environment (by convention it is advisable to call it venv.) locate the folder with the console
source /python -m virtualenv .
3, Active (to deactivate it would be the same but in the end it is placed deactivate.)
-- in Windows
source /venv/Scripts/activate
-- in Linux
source /venv/bin/activate
the name of the virtual environment will appear at the beginning of the line in the command terminal, (venv in this case).
4, To see the packages that we have installed in our virtual environment we execute the following command:
(venv) source /pip list
5, install 'ursina' n all the libs u need
(venv) source /pip install ursina