"ALERT! /dev/mapper/server--vg-root does not exist. Dropping to shell!"

So I guess I messed up my Ubuntu Server just now.

I installed a 500GB hard drive, formatted it with ext4 and then wanted to statically mount via editing /etc/fstab and the UUID.

For some reason I somehow removed the '-' in the UUID because I don't know why. So after rebooting now i get the following:

"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 module (cat /proc/modules; ls /dev)
ALERT! /dev/mapper/server--vg-root does not exist. Dropping to shell!"

Then I get a very limited BusyBox shell.

What I've tried so far is booting with a live USB Ubuntu desktop and mounted the Boot drive but when accessing it there are only the Kernel versions and grub and some more stuff, but not the root files "/etc, /usr, /home, etc" otherwise I'd just have undone the changes to fstab and tried but I don't even get there.

edit (output of fdisk -l):

Disk /dev/sdb: 320.1 GB, 320072933376 bytes
81 heads, 63 sectors/track, 122504 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00094364

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *        2048   625142447   312570200   83  Linux