How do I install Python 3.6 using apt-get?

Ubuntu 14.04 (Trusty) and 16.04 (Xenial)

https://askubuntu.com/questions/865554/how-do-i-install-python-3-6-using-apt-get

If you are using Ubuntu 14.04 or 16.04, you can use Felix Krull's deadsnakes PPA at https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa:

sudo add-apt-repository ppa:deadsnakes/ppa

sudo apt-get update

sudo apt-get install python3.6

Change the Python3 default version in Ubuntu

From the comment:

sudo update-alternatives --config python

Will show you an error:

update-alternatives: error: no alternatives for python3

You need to update your update-alternatives , then you will be able to set your default python version.

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.4 1 sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6 2

Then run :

sudo update-alternatives --config python

Set python3.6 as default.

Or use the following command to set python3.6 as default:

sudo update-alternatives --set python /usr/bin/python3.6

Update pip3

FROM ubuntu:16.04

RUN apt update && \

apt install -y python3-pip

ENV PYTHONWARNINGS=ignore:DEPRECATION

RUN pip3 install --upgrade 'pip<21' 'setuptools<51'

RUN pip3 install pyyaml

Install Real Robot

~/realrobot_ws/src/rplidar_ros$ source devel/setup.bash