I have been checking out the following as my keyboard and trackpad on my macbookpro no longer work. I have followed the instructions here Ubuntu 20.04 LTS mouse and keyboard not working on login screen but I am finding if I go to grub and boot into 5.11.0-46 generic (recovery mode) I can't even select Root using the up / down keys... so as a work around I am currently running on 5.11.0-43-generic #47~20.04.2 - do I need to be in 5.11.0-46 to repair Xorg - if indeed that is the issue? apologies for numerous errors with descriptions etc; - I have experience but not expertise in Linux.
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Your question is decidedly unclear. Please focus. If your latest kernel gives problems, a previous not, then stay on that previous kernel. – vanadium Jan 30 '22 at 10:08
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My apologies - my description is not correct - I will edit / update – ys99x Jan 30 '22 at 12:20
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I have found this Apparently the latest kernel does not work with some keyboards - but it does not say it affects Mac hardware; https://askubuntu.com/questions/1282260/on-board-keyboard-and-trackpad-not-working-20-04/1282269#1282269 – ys99x Feb 01 '22 at 07:11