Results 1 to 4 of 4

Thread: Unable to boot MBP 2011: MODSIGN: Couldn't get UEFI db list

  1. #1
    Join Date
    Mar 2018
    Beans
    1

    Unable to boot MBP 2011: MODSIGN: Couldn't get UEFI db list

    I'm totally new to linux and am trying to install Ubuntu on an old MBP 2011.
    Steps I have completed so far:


    • Create bootable usb using etcher (also created one using diskutil through terminal but I guess there is not much difference there)
    • Create bootable dvd as an alternative to the usb
    • installed rEFInd
    • attempted to boot from both the usb and the dvd


    Which medium I booted from didn't make a difference. After the GRUB menu appeared I chose "try ubuntu without installing" and always received the error
    couldn't get size: 0x800000...
    MODSIGN: couldn't get uefi db list
    couldn't get size: 0x800000...
    after which the system froze and I had to force shutdown.
    Running the boot command from the GRUB terminal returns the message load kernel first.
    Editing the boot options by pressing e and adding nomodeset caused the system to load further giving me the screen as pictured followed by a black screen with a cursor and nothing more.
    I have been unable to find anything helpful on the internet. Any suggestions as to how to proceed would be greatly appreciated. Is it possible that there is a fatal hardware issue behind this? The overheating makes me wonder.... I do have high sierra installed and working fine....
    Attached Images Attached Images

  2. #2
    Join Date
    Jul 2008
    Location
    The Left Coast of the USA
    Beans
    Hidden!
    Distro
    Kubuntu

    Re: Unable to boot MBP 2011: MODSIGN: Couldn't get UEFI db list

    Moved to Apple Hardware Users.
    Please read The Forum Rules and The Forum Posting Guidelines

    A thing discovered and kept to oneself must be discovered time and again by others. A thing discovered and shared with others need be discovered only the once.
    This universe is crazy. I'm going back to my own.

  3. #3
    Join Date
    Jul 2016
    Beans
    1

    Re: Unable to boot MBP 2011: MODSIGN: Couldn't get UEFI db list

    Can you please provide the link to where this was moved to?

  4. #4
    Join Date
    Feb 2014
    Beans
    29

    Re: Unable to boot MBP 2011: MODSIGN: Couldn't get UEFI db list

    You need to press "e" when the cursor is on try ubuntu without installing and then enter nomodeset after the last text and then press F10.

    I have been trying to install on my MBP 2010 this was the first issue I came across.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •