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Ubuntu 20.04: Kernel and display manager not loading on system boot

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OS: Ubuntu 20.04.2 LTS x86_64

Kernel: 5.8.0-63-generic

Hi! I have problem with my Ubuntu. When I try to boot, it shows me an error you need to load the kernel first. I googled a lot about this issue and I try to fix it with my grub (v2.04).

When I set prefix like this: set prefix=(hd0,gpt2)/boot/grub terminal just freeze. No matter how long I wait prompt doesnt show again. I restart system (using ctrl + shift + del) and then my ubuntu run but without display manager. I have access only to terminal where it ask me about my login and password. Then I run sudo systemctl start gdm3 and system starts normally.

I don't know how to detect whats wrong and how can I fix it so I'll be glad for any help!

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