Kubuntu 15.04 stuck in grab screen after upgrade from 14.10

[Guest]

Greetings everyone,
I upgraded Kubuntu to 15.04 version and everything worked fine for a few days until suddenly it failed to boot and got stuck on grub.
I did not install any other OS or anything else at all.
I tried to use boot-repair and got this URL paste ubuntu com 10960480 (since its my first post I cannot paste the full URL)
The problem remains, and now it passed the grub screen. However now the following messages appear:

Gave up waiting for root device. Common problems:
- Boot args (cat /proc/cmdline
- check rootdelay (did the system wait long enough?)
- check root = (did the system wait for the right device?)
- missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/disk/by-uuid/1d920787-d7c1 does not exist. Dropping to a shell!

BusyBox v1.22.1 (Ubuntu 1:1.22.0-9ubuntu1) built-in shell (ash)

I would appreciate any ideas on how to solve this problem.
Thanks

[vinnywright]

possibilities ,,,,, you changed some partitions around on your drive and the UUID's changed ,,,,,,,,,,you messed with /etc/fstab and changed the UUID for / ,,,,,,,,,,or some how you changed /boot/grub/grub.cfg and the rong UUID is listed for / ,,,,,,,,,,,if you have a live USB/cd boot it up and do a

sudo parted -l

to see your drive's /dev associations then a

sudo blkid

to see the UUID's for each partition .....then look to see what your install has for the UUID in /etc/fstab for / (it should match the UUID for what blkid listed for the partition your install is in) and /boot/grub/grub.cfg

VINNY