Install apt-show-versions by entering the following commands in the terminal:
sudo apt update sudo apt install apt-show-versions
lists available package versions with distribution
apt-show-versions parses the dpkg status file and the APT lists for the installed and available package versions and distribution and shows upgrade options within the specific distribution of the selected package. . This is really useful if you have a mixed stable/testing environment and want to list all packages which are from testing and can be upgraded in testing.