Check out these Ubuntu Phone apps below:
Shine enables you to control hue, brightness and colours of Hue lights. You can create groups to turn on/off multiple lights at once. Additionally, you can also add new lamps and upgrade the bridge's firmware. The Hue Tap module in this app allows to configure your Hue Tap switches, even allowing you to cycle through multiple scenes with a single button. With the latest release, there's no need to dig out your old phone any more to upgrade your bridge's firmware or install new lights either. Your Ubuntu phone can do it all.