How to install UmbrelOS on old x86 non-UEFI boot computer and make it bootable

Guides
1
  1. Download the latest UmbrelOS USB installer on your computer (umbrelos-amd64-usb-installer.iso).
  2. Download the Super Grub2 Disk classic CD-ROM bootable image (supergrub2-classic-2.06s4-multiarch-CD.iso).
  3. Create Ventoy bootable USB flash drive.
  4. Copy both downloaded iso images on created USB flash drive.
  5. Boot target computer from created USB flash drive.
  6. Select “umbrelos-amd64-usb-installer.iso” from list, then select “Boot in grub2 mode”.
  7. Started UmbrelOS installer. Follow Step 3 of the official guide.
  8. Boot target computer from created USB flash drive again.
  9. Select “supergrub2-classic-2.06s4-multiarch-CD.iso” from list, then select “Boot in normal mode”.
  10. Started Super Grub2 Disk. Select “Boot manually…”, then “Linux from /boot partition”, then first “- /vmlinuz-X.X.X-X-amd64 (hd1,gpt1)”.
  11. Started UmbrelOS. Log in locally or over SSH. Login: umbrel, password: umbrel.
  12. Making the system disk bootable. Execute the following commands in sequence:
    sudo apt install grub-pc grub2-common
    sudo grub-install /dev/sda --force
    sudo update-grub
  13. Remove USB flash and reboot. The system should boot successfully.
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