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Grrrrrub2 again!!



Hi,
I did a new squeeze install on a desktop with dual boot, and install grub 2. 
System boot fine in debian, but $W was not present. No problem, I had this 
problem before and a simple update-grub solved it. But this time I got an 
error message:
usr sbin grub-probe error cannot find a device for / (is /dev mounted)
I am 'googling for about 10 hours now, but no luck.
I purged and reinstall grub, still got the error, then performed a :
grub-install /dev/sdb which went OK, but still update-grub gave the error.
here is /boot/grub/device.map:
(hd0)	/dev/hda
(hd1)	/dev/sda
(hd2)	/dev/sdb

hd0 must be the dvd drive, hd1  the HD with $W,  hd2 the HD with squeeze on. 
It is split this way:
dev/sb1 /boot
dev/sdb1  a LVM

df -k gives
/dev/dm-0		/
/dev/sdb1		/boot
/dev/dm-5		/home
/dev/dm-4		/tmp
/dev/dm-1		/usr
/dev/dm-2		/var

Any tips, links welcome
Thierry


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