I downloaded Postman for Linux (from https://www.getpostman.com/apps), unpacked .tar.gz file into ~/bin/postman and then tried to execute ~/bin/postman/Postma
As postman chrome app has deprecated so, Postman Native app is available to support native plateforms.
You can install Postman on Linux/Ubuntu via the Snap store using the command in terminal.
$ snap install postman
After successful installation you can find this in your applications list.