Ubuntu 16.04
Mac (PowerPC) and IBM-PPC (POWER5) server install imageFor Apple Macintosh G3, G4, and G5 computers, including iBooks and PowerBooks as well as older IBM OpenPower 7xx machines.
PowerPC64 Little-Endian server install imageFor POWER8 Little-Endian computers, such as Power Systems S8xxL/LC Linux-only servers.
http://cdimage.ubuntu.com/releases/16.04/release/