Problem installing matplotlib using conda and virtual environment. ModuleNotFoundError
I have tried to install matplotlib in my environment &quot;cs323V2&quot;with the following commands:
(cs323V2) conda install matplotlib
Collecting package metadata (current_repodata.json): done
Solving environment: done

# All requested packages already installed.

Retrieving notices: ...working... done
(cs323V2) python
Python 2.7.5 (default, Nov 16 2020, 22:23:17) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)] on linux2
Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.
[3]+  Stopped                 python
&gt;&gt;&gt; import matplotlib
Traceback (most recent call last):
  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
ModuleNotFoundError: No module named 'matplotlib'


Use the conda-forge channel.
conda install -c conda-forge matplotlib

I am not really sure why only
conda install matplotlib 

does not work.
