Earlier this week I was trying to install Debian on a old G4 with PowerPC 7400 processor... Obviously I couldn't use the latest Debian release as it doesn't support 32-bit PowerPC... So I downloaded network installation image of Debian 10, which still supports PowerPC... During installation I had no networking, and the installation stopped when it tried to download more packages to install.
I took snapshot of the hard disk and copied it to my Windows 10 PC running on Intel i5 9600k... I opened the hard disk image with 7zip, looked up the boot partition and copied over the kernel and initrd images. Then I booted up qemu using the disk image, kernel and initrd image and tried if I could get networking. After a while I noticed it could connect to the repository but downloading any files would fail as Debian doesn't recognize the key used to sign the installation packages... Looking up information on internet, I figured out I need to disable key checking on apt to be able to install wget, so I can download the signing key from ports server. After I downloaded the signing key, I could start downloading more packages and install them, so I could really use Debian for testing and benchmarking code. Finally I managed to install GRUB, so Linux could boot when I copy the image back. I didn't use quik or yaboot as they failed to install due to Debian not creating correct partition at the start of disk or formatting the partitions with incompatible filesystem.