Had upgraded my 1420N before, ultimately to Hardy, with problems losing sound, but muddled on through thanks to Dell Linux wiki. Usual problems with wi-fi led, sound, on every kernel upgrade, solved by backporting and following instructions on the wiki.
So it was with trepidation that I upgraded in one night from Hardy to Intrepid to Jaunty.
With Intrepid, the only issue was getting the cool new Network Manager to manage. It was grayed out. I had no visible network configuration yet my wireless (which I adventurously used for the upgrade) “just worked”. Found through Googling that this was a feature, not a bug. So was able to enable the cool new (bears repeating) Network Manager by editing (after saving a copy) /etc/NetworkManager/nm-system-settings.conf to read as follows:
Only down side has been that compiz now gone, haven’t had time to figure out how to bring it back. Preferences/Appearance/Visual Effects tells me “Desktop effects could not be enabled”, even though it seemed to find a driver. Compiz Config Settings Manager, which I had installed, was reset to default values. Anyone have any ideas?