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this post was submitted on 06 Oct 2024
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Linux
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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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Ubuntu will boot on either legacy or UEFI.
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.