Please be aware that during a next upgrade in your system, Debian tries to install a new version of Grub. The installation of Grub-ieee1275 will lead to a corrupted boot partition. Immediately after installation make sure you have hfsprogs installed, if not:sudo apt install hfsprogs
Then repair the boot partition:sudo fsck.hfs /dev/sda2
See here.
If you don’t repair your boot partition, you risk that your MintPPC system won’t be able to boot anymore.
Update 21 June: Another upgrade installed a new /usr/lib/xorg/modules/libglamoregl.so messing up X. I had to rename it again into libglamoregl.so.bak.
I just installed MintPPC on Debian 13. To make it work, I first installed Debian 13 minus the desktop and changed /etc/apt/sources.list to…
deb http://deb.debian.org/debian-ports/ sid main
deb http://deb.debian.org/debian-ports/ unreleased main
deb [signed-by=/etc/apt/keyrings/mintppc.asc] http://u58733p55594.web0093.zxcs->
deb [signed-by=/etc/apt/keyrings/mintppc.asc] http://u58733p55594.web0093.zxcs->
Then, I installed LXDE and all the apps on the Manual Installation page. Worked without a hitch.
Great! You can also do automated installations now, they work for both MintPPC32 and MintPPC64, much easier.