Bug#542425: grub-probe: error: cannot find a device for /.

[Marc Haber]

Package: grub-pc
Version: 1.96+20090808-1
Severity: normal

Hi,

when trying to install grub-pc on an existing Debian sid system, I get
the following output:

Setting up grub-pc (1.96+20090808-1) ...
grub-setup: warn: This msdos-style partition label has no post-MBR gap; embedding won't be possible!
grub-setup: warn: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and its use is discouraged.
Installation finished. No error reported.
This is the contents of the device map /boot/grub/device.map.
Check if this is correct or not. If any of the lines is incorrect,
fix it and re-run the script `grub-install'.

(hd0)   /dev/sda
grub-probe: error: cannot find a device for /.

dpkg: error processing grub-pc (--install):
 subprocess installed post-installation script returned error exit status 1

This is my /proc/mounts
rootfs / rootfs rw 0 0
none /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
none /proc proc rw,nosuid,nodev,noexec,relatime 0 0
udev /dev tmpfs rw,relatime,size=10240k,mode=755 0 0
/dev/mapper/zgserver--sid-root / ext3
rw,relatime,errors=remount-ro,data=writeback 0 0
tmpfs /lib/init/rw tmpfs rw,nosuid,relatime,mode=755 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620 0 0
/dev/sda1 /boot ext3 rw,relatime,errors=continue,data=writeback 0 0
/dev/dm-1 /mnt/usr ext3 rw,relatime,errors=continue,data=writeback 0 0
/dev/dm-2 /mnt/home ext3 rw,relatime,errors=continue,data=writeback 0 0
/dev/dm-3 /mnt/var ext3 rw,relatime,errors=continue,data=writeback 0 0
tmpfs /tmp tmpfs rw,relatime 0 0

Shouldn't grub be able to find the device for / here?

Greetings
Marc