I just started using Lubuntu and I really like its speed and simplicity. However, I found that there is no way to lock the screen without technical knowledge. There is no menu item to lock the screen and the keybinding Ctrl+Alt+L doesn't work. Apparently this is a fairly common problem because there are several websites with instructions on how to add the Ctrl+Alt+L keybinding to LXDE. Could this keybinding be included by default? I realize that LXDE is very minimalist, but locking the screen is a pretty significant feature that is worth 5 lines in a configuration file.