Bug#544577: grub-probe: error: cannot find a device for /.

[John Goerzen]

Felix Zielcke wrote:
> 
> Probable you're also affected by the change of dmsetup 2:1.02.36-1 that
> made the files in /dev/mapper/* symlinks to /dev/dm-*. That was reverted
> in 2:1.02.36-2.
> See 543795, 542425 and 542435.
> For some people just upgrading the package to -2 and even rebooting
> doestn't fix it.
> Check with `ls -l /dev/mapper/' to which /dev/dm-X device your root lv

Strangely, only the link for this particular fs was broken.  That
command did fix it.

Thanks, Felix.

-- John