Nautilus is the default file manager used in Gnome by most of the Linux distributions, now even though nautilus is extremely user friendly and has wide array of features (including ability to extend it's feature set with scripts and extensions). All these features does make nautilus bit resource hungry especially if you are using older machine. In this article i discuss PCMan File Manger which is a lightweight alternative to nautilus and how to set various menus in Ubuntu to using PCMan File manager instead of using nautilus.