fstab & LVM logical volumes

[ubuntu prole]

I installed 7.10 on LVM following these instructions (
http://www.debuntu.org/how-to-install-ubuntu-over-lvm-filesystem ) and
everything is working perfectly.

I want to allocate some of the free space contained within the volume and so
I allocated another logical volume.  However when I go to add it to
/etc/fstab the UUID provided by lvdisplay doesn't work.

Does anyone know how to get the proper UUID for the logical volume?

I've also tried using the /dev/mapper entry in fstab but I get a message
saying that the mount point doesn't exist.

Help!
Mark

-- 
I don't believe I understand all I know about this.
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