Step by step guide to install Python 3.6 and pip3 in Ubuntu
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Install the necessary packages for Python and ssl:
$ sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev
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Download and unzip “Python-3.6.8.tar.xz” from https://www.python.org/ftp/python/ into your home directory.
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Open terminal in that directory and run:
$ ./configure
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Build and install:
$ make && sudo make install
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Install packages with:
$ pip3 install package_name
Disclaimer: The above commands are not tested in Ubuntu 20.04 LTS.