`pip install -r requirements.txt` will cause `ERROR: Cannot uninstall 'certifi'.` (Ubuntu 20.0.4)

[bonzo-ntu]

My environment is
Ubuntu 20.0.4
Conda 22.9.0
Python 3.6.15

When execute pip install -r requirements.txt will cause error:

Attempting uninstall: certifi
    Found existing installation: certifi 2016.9.26
ERROR: Cannot uninstall 'certifi'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.