Hmmm...well the first clue says
ALERT! /dev/disk/by-uuid/8a88a251-3be3-4727-b60e-bba76368c81e does not exist. Dropping to a shell!
was that the partition your /boot drive was located (point to mbr)?
seems like it is looking for a critical partition in the start-up/shutdown of the device.
so what has changed since the new install? Also you may want to investigate your /etc/fstab file.
# ls -l /dev/disk/by-uuid
# grep -i uuid /etc/fstab
Hope that helps...