Install Python 3.10.x on Ubuntu 20.04

README.md

Prerequisite

sudo apt update
sudo apt install software-properties-common -y

Add custom APT repository

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update

Press ENTER to confirm adding repository.

Install Python 3.10

sudo apt install python3.10 python3.10-venv python3.10-dev
python3 --version

You will see previous of Python. At the writing time Python 3.8.10

Make symbolic link (Optional)

Caution

This may cause problem with terminal not open on Ubuntu

https://askubuntu.com/questions/1397938/terminal-not-opening-after-changing-python-version

ls -la /usr/bin/python3
sudo rm /usr/bin/python3
sudo ln -s python3.10 /usr/bin/python3
python3 --version

Now you will see Python 3.10.x

Install PIP for Python 3.10

curl -sS https://bootstrap.pypa.io/get-pip.py | python3.10
python3.10 -m pip --version

Test with system ENV

python3.10 -m pip install ipython

Test with Virtual ENV

python3.10 -m venv venv
pip install ipython

References

https://computingforgeeks.com/how-to-install-python-on-ubuntu-linux-system/

Hey, I build it from source, I am writing my commands for helping anyone seeking for answers in future

sudo apt-get update
sudo apt-get install -y --no-install-recommends \
    build-essential \
    curl \
    wget \
    libssl-dev \
    zlib1g-dev \
    libncurses5-dev \
    libncursesw5-dev \
    libreadline-dev \
    libffi-dev \
    libsqlite3-dev \
    libbz2-dev \
    liblzma-dev \
    tk-dev \
    uuid-dev

cd /tmp
curl -O https://www.python.org/ftp/python/3.10.15/Python-3.10.15.tgz
tar -xf Python-3.10.15.tgz
cd Python-3.10.15

./configure --enable-optimizations --enable-shared --with-ensurepip=install

make -j"$(nproc)"


sudo make altinstall

sudo ldconfig

#### Made it system wide default for use
sudo ln -sf /usr/local/bin/python3.10 /usr/local/bin/python
sudo ln -sf /usr/local/bin/python3.10 /usr/local/bin/python3
sudo ln -sf /usr/local/bin/pip3.10 /usr/local/bin/pip
sudo ln -sf /usr/local/bin/pip3.10 /usr/local/bin/pip3
sudo ln -sf /usr/local/bin/python3.10 /usr/bin/python
sudo ln -sf /usr/local/bin/python3.10 /usr/bin/python3
sudo ln -sf /usr/local/bin/pip3.10 /usr/bin/pip
sudo ln -sf /usr/local/bin/pip3.10 /usr/bin/pip3

#### Used update alternatives for system-wide default
sudo update-alternatives --install /usr/bin/python python /usr/local/bin/python3.10 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.10 1

#### and setup environment variables (add to ~/.bashrc)
echo 'export PATH="/usr/local/bin:$PATH"' >> ~/.bashrc
echo 'export PYTHONPATH="/usr/local/lib/python3.10/site-packages:$PYTHONPATH"' >> ~/.bashrc
echo 'export LD_LIBRARY_PATH="/usr/local/lib:$LD_LIBRARY_PATH"' >> ~/.bashrc
source ~/.bashrc



#### then cleaned up 
cd /
rm -rf /tmp/Python-3.10.15*