You could use your live usb, chroot into your system and run the updates again:
pacman -Syu
Also in the chroot, run:
mkinitcpio -P
exit
the chroot and reboot. Hopefully it will have sorted out the issue then.
You could use your live usb, chroot into your system and run the updates again:
pacman -Syu
Also in the chroot, run:
mkinitcpio -P
exit
the chroot and reboot. Hopefully it will have sorted out the issue then.