Getting pkg_resources module not found error

[VIGNESHWAR10]

I installed yubikey in ubuntu-18.04(WSL) using below commands:
sudo apt-add-repository ppa:yubico/stable
sudo apt update
sudo apt install yubikey-manager

I checked it's version using : ykman --version
But I got an error like:
Traceback (most recent call last):
File "/usr/bin/ykman", line 6, in
from pkg_resources import load_entry_point
ModuleNotFoundError: No module named 'pkg_resources'
Please do help me with this