Установите почтальон в Ubuntu 20.04
sudo snap install postman
Janmejay
sudo snap install postmandownload postman archive
$ cd Downloads/
$ tar -xzf Postman-linux-x64-7.32.0.tar.gz
$ sudo mkdir -p /opt/apps/
$ sudo mv Postman /opt/apps/
$ sudo ln -s /opt/apps/Postman/Postman /usr/local/bin/postman
$ postman