PowerMac G5 Dual-Core (not Dual CPU!) 2.0Ghz, 7GB RAM, NVIDIA FX4500 512MB DVI-Dual-linked to Acer 27" @2560x1440, Super Drive, WLAN via USB-Dongle, Windows-Keyboard (Skiller PRO), Logitech G5 Mouse.
All specs: http://www.everymac.com/systems/apple/powermac_g5/specs/powermac_g5_dual_2.0.html
16.04+16.10 does not boot into a usable Desktop, see: Ubuntu Mate 16.04 LTS does not even boot live-dvd PowerMac G5
As a side-note: I also got an iBook G4 1.33Ghz, 1.5GB RAM, 32MB ATI 9550 Raedon Mobility, 16GB SSD
All specs: http://www.everymac.com/systems/apple/ibook/specs/ibook_g4_1.33_12.html
16.04. boots and installs - but GUI freezes after a random amount of time, see: MATE 16.04 on iBook G4 GUI freezes - does not work