Laptop not shutting down or rebooting completely

This sounds like an ACPI issue.
ACPI = Advanced Configuration Power Interface.

You might try a grub parameter to prevent ACPI errors and see if that helps your issue.
You can try acpi=force or acpi=off.
After setting a grub parameter, remember that you must run

sudo update-grub

for the changes to take effect.

How to add a parameter:

The above guide uses nomodeset as a parameter. You will be using acpi=off, not nomodeset.

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