how-to-change-python-version-on-ubuntu

Follow the simple steps to install and configure Python 3.9.0

Step 1: Add the repository and update The Latest Python 3.9 not available in Ubuntu’s default repositories. So, we have to add a repository. On launchpad repository named deadsnakes is available for Python Packages.

Step 1: Add the deadsnakes repository and update the package list using the below commands.

sudo add-apt-repository ppa:deadsnakes/ppa && apt-get update

Step 2: Install the Python 3.9.0 package using apt-get

sudo apt-get install python3.9

Step 3: Add Python 3.6 & Python 3.9 to update-alternatives Add both old and new versions of Python to Update Alternatives.

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.9 2

Step 4: Update Python 3 for point to Python 3.9 By default, Python 3 is pointed to Python 3.6. That means when we run python3 it will execute as python3.6, but we want to execute this as python3.9.

Type this command to configure python3:

sudo update-alternatives --config python3