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# Removes all but config files.
sudo apt-get remove nginx nginx-common
# Removes everything.
sudo apt-get purge nginx nginx-common
# After using any of the above commands, use this in order to remove dependencies used by nginx which are no longer required.
sudo apt-get autoremove
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sudo apt-get remove nginx nginx-common
or
sudo apt-get purge nginx nginx-common
sudo apt-get autoremove