How to install miniconda and using environment

Refer to:

•  Using QGIS from Conda 
• Install Miniconda or Anaconda 
  

For example,

conda create --name qgis_stable

To use an environment, you need to activate it.

conda activate qgis_stable

Your terminal prompt will show you the active environment.

(qgis_stable) aneto@oryx:~/miniconda3$

To deactivate the current environment, you run

conda deactivate