I have successfully installed Ubuntu 6.06 on Dell Latitude D410.
The installation is much smoother than the previous versions. Everything works out of the box. My LCD panel has a native resolution of 1024×768 that Ubuntu detected automatically. What surprises me a little is that Fn-F8 works out of the box by switching the display to the external monitor. However, the display resolution for the external monitor is limited to that of the native panel.
The next step is to simply add the additional resolution the external monitor supports. Just googling “ubuntu change resolution” or simply edit “/etc/X11/xconf.org” and add “1280×1024″ in front of all instances of “1024×768″. After restarting X by pressing Ctrl-Alt-Backspace, the display switched back to the laptop. Unfortunately, when the display is switched back to the external monitor, the resolution is still limited by the laptop.
After some panicing, despair and more googling, the solution comes really simply:
Instead of pressing Ctrl-Alt-Backspace after the boot, press it during the Grub selection menu. Than the default display switches to external monitor and Ubuntu will happily comply to the new resolution on the external monitor.