AMD Athlon 64 X2 4400+主机启动Ubuntu 20.04 DVD出现Grub未知文件系统错误的问题咨询

Hey there! Let's dig into why your trusty old Athlon 64 X2 4400+ runs Fedora 36 smoothly but throws a GRUB "unknown filesystem" error when booting Ubuntu's DVD. Here are the most likely culprits and fixes to try out:

• GRUB Compatibility Differences
  Fedora and Ubuntu use different GRUB configurations and possibly different versions under the hood. Early AMD64 hardware like your Athlon 64 X2 might have trouble with certain filesystem drivers that Ubuntu's GRUB setup relies on. Fedora 36's installer likely includes better fallback support or loads compatible filesystem modules by default for older systems.

• DVD Image Filesystem Format
  Some newer Ubuntu installation images use extended ISO 9660 formats (like UDF) that older BIOS/optical drives struggle to recognize. Fedora 36's image probably sticks to a more traditional ISO 9660 structure or includes compatibility layers that your aging hardware can handle.

• BIOS Settings Tweaks
  Your old motherboard's BIOS might have settings that interfere with Ubuntu's boot process:

  • Switch SATA Mode from AHCI to IDE (older hardware often has better compatibility with IDE mode).
  • Double-check the boot order to ensure the DVD drive is prioritized, and confirm the BIOS detects the DVD media correctly.
  • Disable Secure Boot if your BIOS has this option (though most Athlon 64-era boards don't include it).

• Try a More Ubuntu-Friendly Variant for Old Hardware
  Standard Ubuntu might be too heavy or have dropped support for your system's components. Give lighter derivatives like Lubuntu or Xubuntu a shot—their installers are optimized for older hardware. You could also test an older Ubuntu LTS release (like 18.04) since newer versions phase out legacy hardware support over time.

Quick Verification Steps #

1. Re-download the Ubuntu (or derivative) image and use a tool like Rufus to create your boot media. Make sure to select the MBR partition scheme (ideal for legacy BIOS systems) instead of GPT.
2. If DVD booting keeps failing, try a USB boot drive—older optical drives sometimes struggle with modern image formats, whereas USB is often more reliable.

备注：内容来源于stack exchange，提问作者Trev