If not, does this mean I have to reinstall Linux and I lose everything on the computer?
You can "roll back" to an earlier kernel. If a kernel update, caused some problem, or is suspected of causing an issue you; Reboot, holding left shift key while doing so to invoke the grub menu, then choose "advanced options", There you choose the previous working kernel, and continue boot.
> If not, does this mean I have to reinstall Linux and I lose everything on the computer?
>> You can "roll back" to an earlier kernel. If a kernel update, caused some problem, or is suspected of causing an issue you; Reboot, holding left shift key while doing so to invoke the grub menu, then choose "advanced options", There you choose the previous working kernel, and continue boot.
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