Ubuntu Server has been my favorite Linux distribution for years. On everything but the Raspberry Pi I run Ubuntu Server but felt stuck with Raspbian on the Pi. Until now!
The Raspberry Pi 4 is now supported. Previously Ubuntu Server for Pi (like many other distros) had broken or completely missing drivers for core components such as WiFi / Bluetooth. In the 18.04.2 update the firmware for the WiFi and other components is now included out of the box making it a fully functional distribution!