Messages appear during booting

It seems to boot well, but some messages appear:

Not sure if this is any problem though.

Likely that it is harmless. However, if concerned, you may check if you need to update your BIOS. You may also consider using a different kernel to see if that resolves it.

It would look as though pointing to a bug in the firmware, not the kernel (last comment on this page):

most likely harmless… but the warning signs are there.

Try acpi=strict in /etc/default/grub between quiet splash and then do update-grub in terminal with the sudo command.