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

[Felix Zielcke]

Am Dienstag, den 01.09.2009, 11:43 -0500 schrieb John Goerzen:
> Package: grub-pc
> Version: 1.97~beta1-1
> Severity: important
> 
> On upgrading this package on a system with working grub-pc already, I
> see:
> 
> Setting up grub-pc (1.97~beta1-1) ...
> 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
> (hd1)   /dev/sdb
> (hd2)   /dev/sdd
> grub-probe: error: cannot find a device for /.
> 
> dpkg: error processing grub-pc (--configure):
>  subprocess installed post-installation script returned error exit
>  status 1
> Errors were encountered while processing:
>  grub-pc
> 
> root here is /dev/mapper/crypt-root.  I am unsure if it is safe to
> reboot at this point.  Did something with crypt mounts get broken?
> 
> The previous version was 1.96+20090808-1
> 

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
links to and then run `echo change > /sys/block/dm-X/uevent'
If that doestn't fix it, `rm /dev/mapper/volume && cp -R /dev/dm-X /dev/mapper/volume'

-- 
Felix Zielcke
Proud Debian Maintainer