Install apt-show-source by entering the following commands in the terminal:
sudo apt update sudo apt install apt-show-source
Description:
Shows source-package information
This program parses the APT lists for source packages and the dpkg status file and then lists every package with a different version number than the one installed. It's very useful if your deb-src sources.list entries point to unstable and your deb entries point to stable.
Version: 0.10+nmu5ubuntu1
Section: universe/admin