Since Chrome apps are now being depracated. Download postman from https://dl.pstmn.io/download/latest/linux
tar -xzf Postman-linux-x64-5.3.2.tar.gz
If any version is installed before, remove it.
sudo rm -rf /opt/Postman
Move Postman
sudo mv Postman /opt/Postman
Create a symbolic link
sudo ln -s /opt/Postman/Postman /usr/bin/postman
Create a desktop file
cat > ~/.local/share/applications/postman.desktop <<EOL
[Desktop Entry]
Encoding=UTF-8
Name=Postman
Exec=postman
Icon=/opt/Postman/app/resources/app/assets/icon.png
Terminal=false
Type=Application
Categories=Development;
EOL
Remove the tar:
rm Postman-linux-x64-$version.tar.gz