Okay, a newbie here with a big problem. I installed Ubuntu 20.04 on my 2009 MacBook Pro. I am completely new to the world of Linux and have yet to discover everything. However, I could not dim the backlight of my MacBook. I come across several tips on the internet. Now I have run the below and restarted. (See Screenshot)
However, now my backlight switches off during start-up and I can no longer see / do anything. I don't know if it is frozen or something like that because the keyboard backlight is no longer responding. And he did before.
I previously had that my screen first showed the following at startup: "Failed to Set MokListRT: Invalid Parameter Could not create mokListRT: Invalid Parameter Importing MOK states has failed: import_mok_state () failed: Invalid Parameter Continuing boot since secure mode is disabled. "
I then replaced shimx64.efi with grubx64.efi by running the following:
"sudo su -
cp grubx64.efi shimx64.efi
This indeed ensures that this message is no longer visible. However, what strikes me is that now at start-up the screen briefly shows a black screen with a white dash. Then the screen turns off. This takes a while (starting up with this creature takes an average of 1.5 minutes to 2 minutes. Then the screen briefly shows an NVidia logo. It disappears again and only after that I get to see my desktop and Ubuntu is ready for use.
But now after adding the lines shown in the attachment, it seems that the program is stucked or something... Please help !!