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Thread: Issue establishing dual boot capability

  1. #21
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    Re: Issue establishing dual boot capability

    Glad to see ubuntuforums.org is back up again; it wnet down earlier this morning.

    Discovered how to turn off Fast Boot.

    Searched 'how to disable Fast Boot on Acer V3-572G'
    Acer disable fast boot
    More videos on YouTube
    Press the Windows ( ...
    Type Power Options.
    Click the Settings tab and select Choose what the power buttons do.
    Click on Change settings that are currently unavailable. ...
    On the System Settings window, go to Shutdown settings and uncheck the Turn on fast startup option.
    Click the Save changes button.
    It works. One needs to explore a little bit, this is where you get to the part that turns off Fast Boot, Change settings that are currently unavailable - the font is really blue
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

  2. #22
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    Re: Issue establishing dual boot capability

    One more attempt at Boot Repair
    After Boot Scan is complete, in the advisory box, there is an Advanced capability one can access that shows the recommended repairs, and there is an unchecked box to back up the windows.efi file then renaming it. I checked the box it to enable the backup/rename. Let's see what happens.

    Boot Repair EUVE Enabled, Secure Boot Disabled, Fast Boot Disabled
    Pastebin: http://paste.ubuntu.com/p/t53JD5gvVd/
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

  3. #23
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    Thumbs up Re: Issue establishing dual boot capability

    When booting after the repair,
    The SSD (SDB) shows up in the boot choices when F12 is pressed; although, the choice is Windows Boot Manager on SSD (something Like that)
    when choseit actually the grub prompt which means I need to figure out what filespecs to give it. I expect it is one of these...
    Code:
     ls -Al /boot/efi/EFI/ubuntu
    total 4264
    -rwx------ 1 root root     108 Jun 22 17:22 BOOTX64.CSV
    -rwx------ 1 root root     117 Jun 22 17:22 grub.cfg
    -rwx------ 1 root root 1734528 Jun 22 17:22 grubx64.efi
    -rwx------ 1 root root 1277024 Jun 22 17:22 mmx64.efi
    -rwx------ 1 root root 1341560 Jun 22 17:22 shimx64.efi
    Which one would it be? I think I will try shimx64.efi first. If that doesn't work, second will be grubx64.efi. After that, ????

    Added - that did not work, response was error: can't find command '/boot/efi/EFI/ubuntu'

    Added-more - Rebooted at F12, selected the other option, Windows Boot Manager - Surprise, surprise! (as Gomer Pyle would say) Boot menu appeared with choice to boot into Windows on SDA or Ubuntu on SDB SSD.

    Even though, I never got the Acer V3-572G to boot Ubuntu from a partition on SDA (primary disk), I did get it to boot from SDB which basically addresses my issue of no dual boot. I shall mark this as Solved.

    @oldfred - I found where one sets 'trust' and 'untrust'. It is from the grub command line. At grub help both show up as commands/options.

    Many thanks to tea for one and oldfred for the advice, and for sticking with me through the end.
    Last edited by him610; July 1st, 2021 at 10:59 PM. Reason: Updated info
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

  4. #24
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    Re: Issue establishing dual boot capability

    Your unknown devices seem to keep growing.
    Best to houseclean. Years ago, too many entries crashed systems and bricked them. Blamed Linux, found same issue in Windows, so really UEFI issue. And mostly fixed with fixes to UEFI.
    But still do not let too many unknown get added.

    The Ubuntu boot entry should be /EFI/ubuntu/shimx64.efi. That works for Secure Boot on or off. But only with Secure boot on, if all other boot programs are also signed, so secure.

    You do show one typically correct entry, but it is not in the boot order at all.
    Code:
    Boot000C* ubuntu	HD(2,GPT,a1def4b3-0ef5-4e34-ac11-d4a5450e2dad,0x12c800,0x96000)/File(EFIubuntushimx64.efi)
    UEFI boot install & repair info - Regularly Updated :
    https://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  5. #25
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    Re: Issue establishing dual boot capability

    @oldfred
    How does one go about purge the unknown devices?
    I went to that directory when running the Boot Repair utility, there were no multiple shimx64.efi files there - only one.
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

  6. #26
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    Re: Issue establishing dual boot capability

    You should only have the one /EFI/ubuntu/shimx4.efi that you showed above in post #23.

    In Post #8, I have the commands to remove UEFI boot entries.

    I think each install of grub into UEFI creates new unknown entry. That only gets changed by the "trust" setting procedure to whatever name you want.
    UEFI boot install & repair info - Regularly Updated :
    https://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  7. #27
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    Re: Issue establishing dual boot capability

    @oldfred, thanks
    I went back and reread your advice in Post #8. It works just like you said. I did not fully understand the process when I first read it. When, two days ago? I think I have definitely learned something here, and maybe this thread will help others too.
    After deleting the excess shimx64.efi entries, I discovered I could boot into the LTS 20.04.2 residing on SDA5 after all
    I think I read somewhere that when Windows gets updates, the existing Windows Manager file gets overwritten, and the system reverts to booting only Windows. Do you know if that is true or not?
    If true, I assume one would need to run Boot Repair again.
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

  8. #28
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    Re: Issue establishing dual boot capability

    Both Windows & grub with major updates reset boot order, so they are first.
    Often all you have to do is change boot order using efibootmgr or from within UEFI.
    In some cases you may need to reinstall grub. Boot-Repair is one way to do that.
    Best to always have current versions of a Windows repair/recovery flash drive and Ubuntu live installer.

    Check current order & hex number of each entry:
    sudo efibootmgr -v
    Change boot order with efibootmgr, some require all 4 hex char others 1 is ok.
    sudo efibootmgr -o 0,1,2
    see also
    man efibootmgr
    UEFI boot install & repair info - Regularly Updated :
    https://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

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