Higher number means higher ~# update-alternatives -install /usr/bin/python python /usr/bin/python3.5 ~# update-alternatives -install /usr/bin/python python /usr/bin/python2. You can set more alternatives the last number defines the priority. To set python 3.5 as default use the update-alternatives scripts. In my example Python 2.7 and 3.5 are installed. Lrwxrwxrwx 1 root root 9 /usr/bin/python -> python2.7Ĭheck with versions are already ~# dpkg -l | grep python Put the hello-world-1.0.0 folder inside a second folder called work. Next, we’ll install the dependencies: sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev libsqlite3-dev libbz2-dev Step 3. Put it inside a folder named hello-world-1.0.0. Before installing Python, always make sure that you have your system up to date: sudo apt update sudo apt upgrade Step 2. The update-alternatives scripts allows to change ~# ls -l /usr/bin/python Here is how to make a Debian package (yes, it will work on Ubuntu) from a single Python 3 script. usr/bin/python is in fact a symlink to the current default versions binary. Before installing Python, always make sure that you have your system up to date: sudo apt update sudo apt upgrade Step 2. Debian is still delivered with 2.7 as the default version of python.

Debian install python