Install Python 3.9.13 on Ubuntu 16.04 (Okeanos virtual machine)

install_python.md

Python 3.9.13 installation instructions

Install Python 3.9.13 on Okeanos virtual machine running Ubuntu 16.04.

The tutorial assumes that the current user is user.

Install make

sudo apt-get install build-essential

Install OpenSSL library

# Download the latest version of the OpenSSL library
# See https://www.openssl.org/source/ for newer versions.
wget https://www.openssl.org/source/openssl-1.1.1q.tar.gz

# Extract the downloaded file.
tar zxvf openssl-1.1.1q.tar.gz
cd openssl-1.1.1q/

# Configure and build the OpenSSL library.
./config --prefix=/home/user/openssl --openssldir=/home/user/openssl no-ssl2
make
make install

cd ~

Edit the OpenSSL configuration

Edit the ~/.profile file (using nano ~/.profile or vim ~/.profile). Add the following lines.

export PATH=$HOME/openssl/bin:$PATH
export LD_LIBRARY_PATH=$HOME/openssl/lib
export LC_ALL="en_US.UTF-8"
export LDFLAGS="-L /home/user/openssl/lib -Wl,-rpath,/home/user/openssl/lib"

Reload the file using . ~/.profile

Install pyenv

curl https://pyenv.run | bash

Add the following lines to both the ~/.profile and the ~/.bashrc files.

export PYENV_ROOT="$HOME/.pyenv"
command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"

Then load the scripts exec $SHELL.

Install Python 3.9.13

# Install Python 3.9.13
CONFIGURE_OPTS="--with-openssl=/home/user/openssl --with-openssl-rpath=auto" pyenv install 3.9.13

# Set Python 3.9.13 as your global Python version
pyenv global 3.9.13

The installed Python 3.9.13 can now be executed using python3.