Added amdcpu to kernel Boot parameters, now Linux doesn’t start anymore and gets stuck at nvme0n1p2: clean… Files… Blocks
Is there a way to undo this?
Boot up and stop at the grub boot menu. Edit the boot entry and remove the parameter. Then continue to boot. That is temporary. You have to undo it, like you applied it.
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Since I installed it, it doesn’t pass the grub menu. Is there a way to force it?
Please edit your nonsensical topic title to be clear and concise using actual words.
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Boot up from the live USB, chroot into your installed system, edit its /etc/default/grub and then run… 
update-grub
I hadnt known that was possible, this will be useful in the future. Thanks
Do the reverse of what you did to begin with?
I’ve unmarked the solution because you just created a new topic and apparently haven’t solved anything:
I’m also going to close and unlist (hide) this post in favor of that one. Thank you for posting more information there. 