this post was submitted on 06 Oct 2024
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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That's not necessarily the problem here.
Normally, Fedora would boot on both types of systems, too. However, OP wants to copy an already-existing UEFI install or at least the config to a legacy system, not (necessarily) to find a distro that could be installed from a normal live installer on both boot types.
Thus the Nix recommendations, as theoretically, one centralized config could be copied between systems to create a similar environment on different systems.
@data1701d Ok in that case, boot the os off of a USB and mount all the partitions, start with root on /mnt, then any other partitions relative to /mnt as they would be to root, then mount --bind /dev /mnt/dev, mount --bind /dev/pts /mnt/dev/pts, mount --rbind /sys /mnt/sys, mount --rbind /proc /mnt/proc, and then cp /etc/resolv.conf to /mnt/etc/resolv.conf, now chroot /mnt. Once there remove all existing versions of grub and install grub-pc, which is the bios version, next do grub_install /dev/sda or whatever your primary drive is, then exit chroot and halt the system. Now you should have a bios bootable system you can boot on your bios device.