GRUB doesn't install on G3

[David VANTYGHEM <david.vantyghem@free.fr>]

I tested
https://cdimage.debian.org/cdimage/ports/grub-test/debian-10.0-powerpc-grub-NETINST-1.iso
on an iMac G3 in QAMEU. GRUB doesn't install :

https://framapic.org/zE4TiX2fDkoI/vvygLQpinTrX.png

https://framapic.org/GjnoOaL19Flf/EIRQQsVsPbxO.png

https://framapic.org/vA30S5uVXnvM/efj051RWUpnb.png

https://framapic.org/d4mHx8kHQFVO/CjLb9DMAFiDu.png

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