One can monitor internet speed in ubuntu. Just search for a package called netspeed in the synoptic packet manager. Once marked it, apply for installation. It hardly takes few seconds to download and install. Now right click Panel (next to volume control) --> Add to panel --> type netspeed in the search column --> Now select Network Monitor (netspeed) and Add to the panel. Now onwards it should show your internet speed on your panel. By using netspeed either you can monitor total speed or in coming/out going separately just by right clicking the applet --> preferences and enable /disabling the required options.