I get these errors on booting.
Are these errors serious? How can I fix them?
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Are these errors serious?
Not really. It means your BIOS is reporting things the kernel does not understand. Often ACPI related and probably no working hibernation/suspend. I used to have them too but my ssd is so quick I nowadays do not bother with hibernation/suspend anymore.
How can I fix them?
See the first line: contact your BIOS vendor for fixes. A BIOS update can fix this. The second option would be to report these against the kernel used if this has not happened already (probably is ;) ) and wait for a fix.