I will note to anyone reading this the €79 Amiga-like Morph OS is really good experience on these 32-bit single core PowerPC Macs, very snappy. I also installed Debian 12 Trixie using the Sid branch on my iBook G4 via the USB-A port and using guides (and links to files to get WiFi working) on the Mac Rumours forum I got it working perfectly. Using the Window Maker Window Manager it’s snappy and you get NeXTStep?OPENSTEP experience.