It may be the error with the /etc/fstab file. Give your root password and enter into the maintenance mode. Since the / mounts by default loads a read only you cannot edit the file. So you have to remount it to write using this command
mount -o remount,rw /
Then enter into the fstab file using vim editor and look at the last column. You can see different numbers in it. It is the order at which system checks file system during booting. Most probably /boot will be having a number 1 which means that the partition corresponds to /boot checks first during booting. Find your logic volumes entry in this file and change the last column to 0 so that system will not checks file system during booting.