Install Python venv

We recommend Python 3.11 for the performance improvements

Python 3.12 is already installed on Ubuntu 24

Install Python3.11 on Ubuntu 22

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.11 python3.11-dev python3.11-venv

Install virtual env

cd /opt/variantgrid  # Or wherever your install is
python3 -m venv env # This is recommended place - I added to .gitignore
source env/bin/activate

Seems to work best if you do this first:

python -m pip install --upgrade cython

python3 -m pip install psycopg2-binary
python3 -m pip install ipython # for nice shell
python3 -m pip install -r requirements.txt  # Or requirements-dev.txt