Fix cant find python even if python 3 is installed on ubuntu:
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On Ubuntu 20.04 and newer, there is a package to fix this problem. Run the following commands:

sudo apt update
sudo apt install python-is-python3

Source: https://stackoverflow.com/questions/3655306/ubuntu-usr-bin-env-python-no-such-file-or-directory
Date: October 31st 2022