Install using Anaconda not working
It seems that Conda can only install one version of a package at a time,thus whatever installing command you use it will replace whatever other build you might have installed. So I reinstalled it using conda create -n FERRET -c conda-forge pyferret ferret_datasets --yes. After that I was able to activate the environment with conda activate FERRET If the terminal complains and asks you to initialize a shell, conda init bash should suffice to allow you to activate the environment.