get the gksu package from synaptic and restart.

that adds an "open as administrator" option to the right click on
folder.

then you use that with your login password.


quick easy terminal approach would be to "sudo nautilus" in the
terminal which will open a root file browser window which will allow
you to navigate to the target folder and drop whatever you like in it.

remember to close the root file browser window as soon as you are done
with it to avoid accidents.