How did I fix «RemoveError: 'requests' is a dependency of conda and cannot be removed from conda's operating environment» in AWS DLAMI?

It is occured on conda update -n base -c defaults conda:

01

I have fixed it by the --force flag:

conda update -n base -c defaults --force conda

stackoverflow.com/a/54800368

See also: How did I upgrade Conda in AWS DLAMI?