Sometimes when we execute pip install -r requirement.txt in a newer system, we may encounter such an error

Actually, it is warning you that continuing the execution may break your system's Python environment. Of course, with the attitude of "better safe than sorry," we choose to directly ignore the warning and continue execution
mkdir -p ~/.config/pip/
cd ~/.config/pip/
Then, in your preferred way, create a pip.conf here and write the following content inside
[global]
break-system-packages = true
After that, just execute pip install -r requirement.txt again

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