"python -m django --version" 1.11.18 Cannot update to 2.1 - django

Question

I watched a tutorial that requires me to have Django 2.1.
When I type in "python -m django --version" - my Ubuntu terminal says 1.11.18 But, when I type "django-admin --version" - terminal says 2.1 This didn't bother me until I reached part 6 of this series, I'm heavily invested now with a serious problem I can't figure out. I even completely reinstalled my OS, (I was running Linux mint, thought it'd be easier if I ran Ubuntu) I ran through a myriad of different "fixes" I found online, but nothing seemed to fix this.
The main issue that I ran into from the tutorial is the urls linking.
EDIT:
I have Python 3.6 installed

Answer 1

You need to be using Python-3 to use Django-2.1. Django 1.11 is the last version to support Python 2.7.

Answer 2

The problem is most likely because you've got both Python 2 and Python 3 installed on your system, and you're installing Django without a virtual environment. I would highly recommend using a virtual environment: it keeps your project separated from the system Python version's packages. At this point, using Python 3 and venv to make your virtual environment is the best practice.
See the documentation here: https://docs.python.org/3/library/venv.html#creating-virtual-environments
Here's a quick walkthrough to create a new virtual environment in a directory called "my_django_project" in your home directory with Python 3 and install Django:
python3 -m venv ~/my_django_project
pip install Django
. ~/my_django_project/bin/activate
To deactivate your virtual environment, type deactivate.
Then, whenever you want to work on this project, type . ~/my_django_project/bin/activate.
Now let's say you wanted to work on a separate project using another Python package, like OpenCV. You could create a separate virtual environment for this project:
python3 -m venv ~/my_opencv_project
pip install opencv
. ~/my_opencv_project/bin/activate
This allowed you to keep your projects separate. There is a fair amount more to learn, but this should be enough to get you started. Good luck!