Install the required dependency for adding custom PPAs.
sudo apt install software-properties-common -y
Then proceed and add the deadsnakes PPA to the APT package manager sources list as below.
sudo add-apt-repository ppa:deadsnakes/ppa
Press Enter to continue.
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.......... To install 3rd-party Python modules, you should use the common Python packaging tools. For an introduction into the Python packaging ecosystem and its tools, refer to the Python Packaging User Guide: https://packaging.python.org/installing/
Sources ======= The package sources are available at: https://github.com/deadsnakes/
Nightly Builds ==============
For nightly builds, see ppa:deadsnakes/nightly https://launchpad.net/~deadsnakes/+archive/ubuntu/nightly More info: https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa Press [ENTER] to continue or ctrl-c to cancel adding it
With the deadsnakes repository added to your Ubuntu 20.04|18.04 system, now download Python 3.10 with the single command below.
sudo apt install python3.10
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................... Building dependency tree Reading state information... Done The following additional packages will be installed: libpython3.10-minimal libpython3.10-stdlib python3.10-minimal Suggested packages: python3.10-venv binfmt-support The following NEW packages will be installed: libpython3.10-minimal libpython3.10-stdlib python3.10 python3.10-minimal 0 upgraded, 4 newly installed, 0 to remove and 192 not upgraded. Need to get 5,023 kB of archives. After this operation, 19.7 MB of additional disk space will be used. Do you want to continue? [Y/n] y
Verify the installation by checking the installed version.