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I followed this post: Ubuntu 20.04 Failed to Set MokListRT: Invalid Parameter

I managed to replace the shimx64. Efi with grubx64. Efi, through LIVE Ubuntu.

Now only appears a " _ " on the left side of the screen and nothing more happens. The graphic card from my macbook pro 2011 its faulty (AMD radeon), so I edited the grub (Run the i915) to install and to use the Live Ubuntu.

But now I have no idea what to do, my knowledge is very limited.

karel
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Daniel Rodrigues
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1 Answers1

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Been there! This "_" means that you have booted linux, but looking at a wrong display. Xserver is configured for now absent dGPU. You can switch to another terminal with some Alt+Ctrl+Shift+Fn[1-6] (I cannot remember the exact Ctrl-Shift thingy, and had to use USB PC keyboard), but only in text mode. Than you can debug display config, OR you can

Try disabling PCIe GPU entirely in grub. Hit 'e' during GRUB select, find a string with insmod gzio and type in the following strings above it:

   outb 0x728 1
   outb 0x710 2
   outb 0x740 2
   outb 0x750 0

Press Fn+F10 to boot.

If it boots successfully, modify grub permanently as in this tutorial: https://www.variadic.xyz/2020/06/15/ubuntu-2011mbp/.

Gutleib
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