gconftool-2 --type bool --set /apps/nautilus/preferences/show_advanced_permissions True'' (without the quotes, to disable the feature, simply replace `True' with `False')
If you feel more comfortable to achieve the goal through a GUI way. Here you go:
- press Alt+F2
- type gconf-editor and <Enter>
- from the left pane in the pop-up window, choose app -> nautilus -> preferences
- go to the right pane, find out the show_advanced_permissions, check the box on its right
- close the window, done.
As you look around, you can change other configurations "under the hood" in the same way. It's said that ubuntu-tweak also lets you do many configurations easily, including enable this "show advanced file permission" feature in Nautilus, but I have not try it.