Hello
Sometime ago I bought a second hand Apple computer. It had no operating system, so I installed Mountain Lion on it. I also wanted to add a Linux system.
Which I did. I also added a GUI program to select the operating system of choice. Unfortunately that has failed to work. I now only seem to be able to get the Linux operating system. I would like to regain my ability to select which operating system I want.
Last edited by LockBot on Wed Dec 28, 2022 7:16 am, edited 1 time in total.
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I also added a GUI program to select the operating system of choice. Unfortunately that has failed to work
That program could have ruined the boot loader. I can't help you with how to set it up again.
But meanwhile you could try to press and hold the "ALT" key while booting, to see if MacOS shows up again. Just to try
I have installed Linux Mint 20.1 XFCe on a family members 2009 Imac and used a program called Refind that seems to work pretty good at finding operating systems for Apple/mac. I did have to disable the Security Module in the Mac Bios in order to install Linux. This is the link to Refind on Sourceforge. https://sourceforge.net/projects/refind/. You can also find it in the Software manager in Linux. Hope that works for you.
KentonBarlow wrote: ⤴Tue Jun 22, 2021 2:09 pm
I have installed Linux Mint 20.1 XFCe on a family members 2009 Imac and used a program called Refind that seems to work pretty good at finding operating systems for Apple/mac. I did have to disable the Security Module in the Mac Bios in order to install Linux. This is the link to Refind on Sourceforge. https://sourceforge.net/projects/refind/. You can also find it in the Software manager in Linux. Hope that works for you.
Thank you for the reply, I apologise for the delay in my answer. According to the software manager I actually have it installed, but I am not sure how it works?
Having difficulty finding the bit in Rod's book that explains how to remove rEFIind. Which I would like. However, when I start the machine, this message is produced.
Failed to set MockListRT: Invalid Parameter
Could not create MockListRT: Invalid Parameter
Importing MOK states has failed: import_mok_state0 failed
Continuing boot since secure mode is disabled
The moklist message doesn't have any effect on booting. It's triggered by the efi system looking for xf86_64-efi and you have the shim version, which boots fine (as the last line in the message says). That isn't why your system is failing to boot. Did you run $sudo update-grub? It appears you have one of the machines that boots 32-bit Apple efi and runs 64-bit. This is mine--note the UEFI:Apple. That could be why the GUI boot selection program didn't work. GRUB can handle this and works fine.
My laptop:
Reddog1 wrote: ⤴Tue Jul 13, 2021 4:04 pm
The moklist message doesn't have any effect on booting. It's triggered by the efi system looking for xf86_64-efi and you have the shim version, which boots fine (as the last line in the message says). That isn't why your system is failing to boot. Did you run $sudo update-grub? It appears you have one of the machines that boots 32-bit Apple efi and runs 64-bit. This is mine--note the UEFI:Apple. That could be why the GUI boot selection program didn't work. GRUB can handle this and works fine.
My laptop:
Hi
I updated grub as suggested, but unfortunately it didn't solve my dilemma. I received the message on the attachment after trying to access and logging on to apple. Apologies for the poor picture.