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Install Python3 on Ubuntu#

A quick tutorial for installing Python from its official source on Ubuntu with sqlite3 support.

Disabling IPv6#

IPv6 is enabled by default on Ubuntu 16.04, in some cases, your Ubuntu network connection might be very low due to IPv6. Use ip a | grep inet6 to check if IPv6 is enabled.

Ref: How to disable ipv6 address on ubuntu 18 04 bionic beaver linux

To disable IPv6 in a persist way, add following 2 lines in the file /etc/sysctl.conf and reload the sysctl by sudo sysctl --system or reboot the server:


Installing Python3.10.10 with sqlite3 on Ubuntu 20.04 in WSL#

Same procedure applied to other Python versions too.

# install build packages
sudo apt update
# without `libssl-dev` package, pip install will throw TLS/SSL error.
sudo apt install -y build-essential zlib1g-dev libssl-dev libffi-dev

# install sqlite3 from source, if you need a specific sqlite3 version in Python, you must install it before compiling Python, because the compilation needs the lib
mkdir ~/src
cd ~/src/
tar xvf sqlite-autoconf-3400100.tar.gz
cd sqlite-autoconf-3400100/
./configure --prefix=/usr/local
make -j $(nproc)
sudo make install
make clean
ll /usr/local/bin/sqlite*
ll /usr/local/lib/*sqlite*

# let below Python compilation to use the newly installed sqlite3 lib
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH

# install python3.10.10 from source
cd ~/src/
tar xvf Python-3.10.10.tgz
cd Python-3.10.10/

# ubuntu 20.04 has gcc v9 (v8+ are OK), so you can add the flag --enable-optimizations to ./configure
# to gain an extra runtime speed, otherwise you might encounter `Could not import runpy module` error
# --with-bz2 is for pandas, otherwise modulenotfounderror: no module named '_bz2' pandas
version=$(basename "$(pwd)" | cut -d'-' -f2 | cut -d'.' -f1-2)
sudo ./configure --prefix=$HOME/opt/python$version --with-bz2 --enable-optimizations
make -j $(nproc)
sudo make install
make clean
sudo ln -sf ~/opt/python$version/bin/python$version /usr/bin/python$version
ll $(which python$version)
if ! grep -q 'export PIP_REQUIRE_VIRTUALENV=true' ~/.bashrc; then
    echo 'export PIP_REQUIRE_VIRTUALENV=true' >> ~/.bashrc
    echo "added export PIP_REQUIRE_VIRTUALENV=true"
python$version -c 'import sqlite3 ; print(sqlite3.sqlite_version)'

Prevent pip install without an active venv#

if ! grep -q 'export PIP_REQUIRE_VIRTUALENV=true' ~/.bashrc; then
    echo 'export PIP_REQUIRE_VIRTUALENV=true' >> ~/.bashrc