I have installed Python 3.10 from deadsnakes on my Ubuntu 20.04 machine.
How to use it? python3 --version returns Python 3.8.10 and python3.10 -m venv venv returns error (I’ve installed python3-venv as well).
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Answer
python3.10 --version will work.
python3-venv is for 3.8, so install python3.10-venv. For reference: deadsnakes packages for 3.10 for Focal.