Unable to prepare environment

[jaggi01]

I am using ubantu on windows 10 with the help of virtualbox.
I tried to install cdms using following command:

!conda create -n cdms -y -c cdat/label/nightly -c conda-forge cdms2 libnetcdf==4.6.2
!conda activate cdms

But conda couldn't activate cdms.
I tried to prepare environment by following code:

from future import print_function
import cdat_info
import os, sys

data_path = cdat_info.get_sampledata_path()

version="python"+sys.version[0:3]
cdat_info.download_sample_data_files(os.path.join(sys.prefix,"lib",version,"site-packages","share","cdms2","test_data_files.txt"),data_path)

But it is showing runtime error :
Invalid file type for list of files: /home/jagjeet/anaconda3/lib/python3.9/site-packages/share/cdms2/test_data_files.txt.
Where I am doing wrong.
Need some help regarding this....!