There may be some cases when you want to delete a file permanently without first sending it to trash. Adding a Delete entry to the right-click menu of nautilus can save you a huge amount of time since it allows you to bypass the trash with just one click.

To be able to use this feature, you need to install the dconf-tools package:

sudo apt-get install dconf-tools

Launch dconf Editor and then navigate to:
xorg ⇒ gnome ⇒ nautilus ⇒ preferences

We are almost done. To enable the Delete entry, simply activate the enable-delete option:

WARNING: Enabling this feature could lead to dangerous consequences such as accidentally deleting important files so don't use it unless you know what you are doing.