Hi David,
Try installing with the “oldstable”/“Jessie” CD.
http://cdimage.debian.org/mirror/cdimage/archive/8.11.0/powerpc/iso-cd/
Grub for Powerpc is still a work in progress. It may not work on your old G3 machine. Jessie uses the older “yaboot” bootloader, which may be more stable for your situation. Everybody seems to agree that Grub is the wave of the future, but that wave hasn’t fully crested yet.
Hope this helps!
Rick
> On Feb 11, 2019, at 10:58 AM, David VANTYGHEM <david.vantyghem@free.fr> wrote:
>
> Hello,
>
> I'm a beginner on Macintosh.
>
> I'm trying to install Debian (+ LXDE) on my iMac G3.
>
> I'm using a CD-ROM with
> https://cdimage.debian.org/cdimage/ports/2019-01-27/debian-10.0-powerpc-NETINST-1.iso
> on it.
>
> I've got 2 errors :
>
> 1) An error during the softwares installation :
> https://framapic.org/U8WJdTtyBnT6/4y7B4AB68uBz.jpg
>
> 2) A more important error with GRUB that doesn't install :
>
> https://framapic.org/akOHeksS12oS/Da09AivOaCdX.png
>
> https://framapic.org/mJ8AHgLUdQXb/7xPInXj4wSDY.png
>
> And I can't boot after the end of the installation :
>
> https://framapic.org/52MPBtyV0Qrw/Z9Zi8opwh3F1.png
>
>
> I tested the installation in a virtual computer with QUEMU (AQEMU). I've
> got only the 2) error and the same problem to boot.
>
> Is it a bug or did I make something wrong ?
>
> --
> David VANTYGHEM
> Mél. : david.vantyghem@free.fr
> Installer facilement GNU/Linux : http://numopen.fr
>
> .--.
> |o_o |
> ||_/ |
> // \\ Envoyé avec mon GNU/Linux
> (| |)
> / \_ _/ \
> \___)=(___/
>