I recently aquired an friends old, (PPC) Powerbook G4 Titanium and would like to install Ubuntu as tbh I cannot stand the Apple OS, (of any kind) and was wondering what would the best/most recent version I could expect to install and have good functionality?

I've been using GNU/Linux distros for around 5 years now but have never attempted an install on Apple hardware before so any advice will be greatfully recieved.