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Ubuntu - apt-get - Clean the system

Free up some disk space.

sudo apt-get clean

Only remove packages that have a newer version available

sudo apt-get autoclean

NOTE: autoclean only removes those retrieved package files that have a newer version now, and so will not be used anymore.

This command removes .deb files for packages that are no longer installed on your system.
Depending on your installation habits, removing these files from /var/cache/apt/archives may regain a significant amount of diskspace.

sudo apt-get autoremove

NOTE: autoremove removes libraries and packages that were installed automatically to satisfy the dependencies of another installed package.

If that package is removed, these automatically installed packages are useless in the system, and this command removes such packages.