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Thread: How come installing Xubuntu 20.04 on legacy mode doesn't work?

  1. #1
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    How come installing Xubuntu 20.04 on legacy mode doesn't work?

    When I first got my HP ProBook 450 G2, second hand, it was set to Legacy Mode by default and I was able to install Lubuntu 18.04, it booted just fine, but when I tried to upgrade via clean install to Xubuntu 20.04, it wouldn't boot, I get this message:



    So, the solution I found was to set my boot mode in my BIOS to UEFI. Although, I choose UEFI Native (Without CSM) because I didn't know the difference between that and UEFI Hybrid (With CSM).



    So, after setting my boot mode to UEFI Native (Without CSM) and reinstalling Xubuntu 20.04 afterwards, and it worked, I was able to boot.

    What I'm trying to understand is, why isn't installing Xubuntu 20.04 on Legacy Mode working anymore like it did in Lubuntu 18.04?
    Last edited by salamilimos; May 2nd, 2021 at 11:05 AM.

  2. #2
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    Xubuntu 20.04 Focal Fossa

    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    What did you use to create the USB install media that you used?

    Some USB writing applications don't give you a choice of mode of writing, eg rufus, I believe.
    Did you check the downloaded iso file you used against its published checksum?

  3. #3
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    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    Quote Originally Posted by ajgreeny View Post
    What did you use to create the USB install media that you used?
    I used Startup Disk Creator.

    Some USB writing applications don't give you a choice of mode of writing, eg rufus, I believe.
    Did you check the downloaded iso file you used against its published checksum?
    Yes I did, it matches.

  4. #4
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    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    The motherboard is set to Legacy mode but what about the Ubuntu live.install session. If that is loading to UEFI then this might happen. Just guessing. I have a BIOS motherboard. So, I have no experience of my own from which to give advice.

    Regards
    It is a machine. It is more stupid than we are. It will not stop us from doing stupid things.
    Ubuntu user #33,200. Linux user #530,530


  5. #5
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    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    The boot of the USB is separate from the default boot set in UEFI settings for installed systems.

    Most UEFI offer two boot options for a bootable Ubuntu live installer, one clearly UEFI like UEFI:XXX or XXX where XXX is name or label of flash drive.
    How you boot install media is then how it installs.

    Some tools like Rufus only create an installer in one boot mode or the other. Then the only option in UEFI will be to boot in that mode.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  6. #6
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    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    I'm still confused on what's happening though.

    How come installing Lubuntu 18.04 on this laptop worked when it was set in Legacy Boot Mode? But doesn't work when I try to install Xubuntu 20.04 on the same boot mode, prompting me to set my boot mode to UEFI?

  7. #7
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    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    Again, how you boot install media controls whether you install in BIOS/Legacy or UEFI.
    The default setting in UEFI is only for your installed system, once installed.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  8. #8
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    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    Quote Originally Posted by oldfred View Post
    Again, how you boot install media controls whether you install in BIOS/Legacy or UEFI. The default setting in UEFI is only for your installed system, once installed.
    I booted my liveUSB like this: https://www.youtube.com/watch?v=k0ohDvl-GsY

  9. #9
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    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    Then how did you make USB flash drive?

    And which screen do you get?
    Shows live installer with screen shots. Both BIOS purple accessibility screen & UEFI black grub menu screen 20.10 uses grub for both
    https://help.ubuntu.com/community/UEFI
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  10. #10
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    Re: How come installing Xubuntu 20.04 on legacy mode doesn't work?

    Quote Originally Posted by oldfred View Post
    Then how did you make USB flash drive?

    And which screen do you get?
    Shows live installer with screen shots. Both BIOS purple accessibility screen & UEFI black grub menu screen 20.10 uses grub for both
    https://help.ubuntu.com/community/UEFI
    I used Startup Disk Creator.

    My system boots in UEFI mode, but not in Legacy Mode.

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