I typically use #!/usr/bin/env python as my shebang for Python stuff. I switched to Ubuntu (22.04) from Fedora (36) recently and found that when I tried to run something outside of a virtualenv it bombed out thusly: /usr/bin/env: ‘python’: No such file or directory This stackoverflow post offered two solutions: sudo ln -s /usr/bin/python3 /usr/bin/python sudo apt install python-is-python3 The post that presented the latter pointed me at the package’s description: