My common solution to boot issues that lock me out is,
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Get a USB Live distro (always good to have a backup lying around)
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Boot into live distro
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Chroot into the broken distro (Arch wiki has an article on this)
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Fix any bugs that I can find and/or reinstall the bootloader
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Test, repeat until the problem has been found and fixed
Hope it helps any newcomers!
desire to learn more DSP maths increases
But seriously that’s really cool! You also sound really cool, do you mind me asking where your studies have taken you? I’m looking at going back to study soon, potentially for compsci and mechanical engineering but I’m torn between a lot of different degree at this moment