Bug#604845: grub-pc: update-grub fails with "error: Couldn't, find PV pv1. Check your device.map."

[Adrián Santos Marrero]

Hi, I also had this problem. I fixed it setting 
GRUB_DISABLE_LINUX_UUID=true in /etc/default/grub. This flag changed the 
root=UUID=XXX to root=/dev/mapper/XXX in all the linux entries in grub.cfg.

Regards.

-- 
Adrián Santos Marrero
Galotecnia Redes Servicios y Sistemas	
http://www.galotecnia.com