I get this missing firmware message on apug. Should i worry that i will not be able to reboot?
Not really, I assume this message is just a non-smart check for a possible needed firmware, based on the drivers included in a X version of the kernel and if they their related firmwares, probably based in very generic types of your hardware
In short, you should not worry if you have every driver correctly running, in your case there's related to your graphical card (i915) and for a Realtek wifi driver (module r8169, for card rtl8125). Does they work correctly? if yes, nothing to worry 
