My Latitude 2100 has Ubuntu as its operating system. It is Ubuntu 8.04 and upgrading to Ubuntu 9.04 makes the touchscreen not work as intended.
My Latitude 2100 has an Intel WiFi 5100. I had to set my LinkSys WAG160N DSL router to wpa-personal (instead of wpa-personal2) to be able to get into the network.
My Latitude 2100 has an Intel High-Definition Audio 82801G. It can play sound and it can record sound as long as you plug a microphone in.