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Thread: GRUB 'Unknown filesystem' weirder than usual

  1. #21
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    Maybe output from arvidjaar's bootinfoscript will allow a solution to be determined.
    Reg. Linux User #211409 *** multibooting since 1992
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  2. #22
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    Default Re: GRUB 'Unknown filesystem' weirder than usual


  3. #23
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    The link above is the output of bootinfoscript.

  4. #24
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    Quote Originally Posted by Greenscreener View Post
    When I try to select it in the Boot Menu, ...
    Just to be clear -- is this the BIOS boot menu?

    Some BIOS do not fully initialize USB devices. But if you tell the BIOS to boot from USB device, then they should.

    Maybe check if there are other BIOS settings related to USB devices.
    openSUSE Leap 15.1; KDE Plasma 5;

  5. #25
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    The BIOS on this computer is over all weird. It's like weird graphical thing with a mouse cursor that doesn't really work.


    But to your questions:
    There are two USB related options:
    USB legacy support, which is enabled and Wake On USB, which is also enabled.
    Then there is an option to disable USB entirely.


    The boot menu I was talking about is under the BIOS menu and is called 'Boot Device Options', it contains four options: Notebook Upgrade Bay (I think that's the CD drive), Notebook Hard Drive, USB Hard Drive and Notebook Ethernet.

  6. #26
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    Quote Originally Posted by Greenscreener View Post
    Legacy BIOS
    There is really not much grub2 can do in this case - it completely relies on BIOS for disk access. You may try "nativedisk" command in grub2 CLI - this will attempt to switch from BIOS to native drivers, in particular USB. There is no guarantee that this will actually work, but it is worth the try.

  7. #27
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    It worked, even though I almost gave up! I opened the command line and typed nativedisk. It threw ~10 errors at me. When I tried to ls it froze. So I rebooted did the same procedure again wthout any change, just without the ls. ESC to the menu and selected the /dev/sdb5 and it WORKED!!!

    Thanks a lot guys, you are amazing.

    Is there a way of adding a [SOLVED] tag to this?

  8. #28
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    Quote Originally Posted by Greenscreener View Post

    Is there a way of adding a [SOLVED] tag to this?
    No, your joy as expressed above is enough
    Henk van Velden

  9. #29
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    It even worked twice in a row! Truly amazing. But is there a way of making this semi-permanent? I'll be booting from that drive for a few weeks every day and I don't want to have to access the grub command line each time, but I would like to revert to the original settings after the few weeks.

  10. #30
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    Default Re: GRUB 'Unknown filesystem' weirder than usual

    Quote Originally Posted by Greenscreener View Post
    It [nativedisk] worked
    Quote Originally Posted by Greenscreener View Post
    It even worked twice in a row! But is there a way of making this semi-permanent?
    Please note that if you use the same external USB disk on different systems, there is no guarantee it will work on all of them (and you lose some features like ability to chainload another bootloader). That said "grub2-install --disk-module=native" can be used to install grub2 with native drivers from the very start. There is no way to customize grub2-install used during package upgrade though, so you will need to repeat it after every grub2 update (which happens relatively often on TW).

    Adding grub.cfg snippet should also work and has advantage of being "persistent".

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