If you see the message "The following packages were automatically installed and are no longer required" when you are running apt-get autoremove or apt autoremove on a Debian-based Linux system, such as Ubuntu, it means that the package manager has identified one or more packages that were automatically installed to satisfy the dependencies of other packages, but are no longer needed.
These packages are known as "orphaned packages," and they can accumulate on your system over time as you install and remove other packages. Orphaned packages take up space on your system and can cause clutter, so it's a good idea to remove them when they are no longer needed.
To remove orphaned packages, you can use the apt-get autoremove or apt autoremove command. This command will remove any orphaned packages that are no longer needed, as well as any dependencies that are no longer used by any other packages.
For example, to remove orphaned packages and their dependencies, you can run the following command:
sudo apt-get autoremove
or
sudo apt autoremove
This will remove any orphaned packages and their dependencies from your system. Be aware that this command may remove packages that are still needed by other packages, so it's a good idea to review the list of packages that will be removed before proceeding.