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Ubuntu - apt-get - Clean the system

Free up some disk space.

sudo apt-get clean

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.

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.