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

[Felix Zielcke]

Am Mittwoch, den 19.08.2009, 17:34 +0200 schrieb 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 /.

[...]
> /dev/mapper/zgserver--sid-root / ext3
[...]
> 
> Shouldn't grub be able to find the device for / here?

Did you also upgrade lvm2 to 2.02.51-1?
In that case it's probable the same as #542435