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Thread: Unable to boot after 20.04 install on multiple O/S setup

  1. #11
    Join Date
    May 2020

    Re: Unable to boot after 20.04 install on multiple O/S setup

    I have managed to get 20.04 booting natively.
    Not too sure how though as I reinstalled grub*-common after booting non-UEFI to 16.04, which didn't allow booting directly, so I used another utililty to BOOTMGR (on UBCD) to write the MBR. Things got worse as I couldn't seem to boot anything even using the old method of Smart Boot Manager (on UBCD), so I changed the bios setting to UEFI which still failed to boot, then after changing back to Legacy mode I got the following message on booting:

    'System BootOrder not found'
    'Creating boot entry "Boot0000" with label "ubuntu" for file "\EFI\ubuntu\shimx64.efi"'

    and 20.04 started booting.

    efibootmanager shows:
    Timeout: 0 seconds
    BootOrder: 0000,0003,0002,0001
    Boot0000* ubuntu
    Boot0001* BRCM MBA Slot 0100 v15.4.2
    Boot0002* WDC WD10JPVX-22JC3T0
    Boot0003* HL-DT-ST DVDRAM GU71N
    Boot2001* EFI USB Device
    Boot2002* EFI DVD/CDROM
    Boot2003* EFI Network

    I thought I might try to reinstall the mbr etc via 'grub-install /dev/sda', but I now find this fails!
    grub-install: warning: Internal error.
    grub-install: error: failed to register the EFI boot entry: Operation not permitted.

    The exact reason for this is unknown, but at the moment I can boot my system again - so will leave it alone for a while until I feel brave enough to try again.

    Thanks oldfred for your advice on this, just a shame my system didn't play nicely.

  2. #12
    Join Date
    Jun 2009
    SW Forida

    Re: Unable to boot after 20.04 install on multiple O/S setup

    Then you are using UEFI to boot.
    You may be able to manually boot in BIOS mode thru MBR to old install. But will not be able to boot Windows, unless BIOS grub by passes boot flag & lets you boot it in BIOS mode.
    And if reinstalling Windows in UEFI mode drive would have to be gpt partitioned.

    If now deciding to use UEFI, better to use gpt partitioning. But that is a major change as reinstall and gpt will erase drive.
    There are tools to convert to gpt, but then old Windows will never boot. Windows in BIOS mode has to be on MBR drive.
    But long term, you want to use gpt.
    I planned ahead a bit and started converting new or reconfigured drives to gpt with my old BIOS only system 10 years ago.

    GPT Advantages (older 2010 but still valid) see post#2 by srs5694:
    For more info on UEFI boot install & repair - Regularly Updated :
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

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