Hi! I've just updated Natty after about a week, and my postinstall scripts fail 
with
Generating grub.cfg ...
/usr/sbin/grub-probe: error: unknown filesystem.

Now I've purged everything grub, and reinstalled grub-common 
(1.99~rc1-4ubuntu1), but still
$ sudo grub-probe /
grub-probe: error: unknown filesystem.

I can't install grub-pc, because it aborts with
Creating config file /etc/default/grub with new version
/usr/sbin/grub-probe: error: unknown filesystem.
Auto-detection of a filesystem of /dev/sda3 failed.
Please report this together with the output of "/usr/sbin/grub-probe 
--device-map="/boot/grub/device.map" --target=fs -v /boot/grub" to 
<[email protected]>

Note that I don't even have /boot/grub/device.map. And I have btrfs
root, which contains /boot. Is this a regression in the package? And
what should I do before reboot? :-)

** Attachment added: "output of "/usr/sbin/grub-probe 
--device-map="/boot/grub/device.map" --target=fs -v /boot/grub""
   
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/732149/+attachment/1920462/+files/grub-probe.txt

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https://bugs.launchpad.net/bugs/732149

Title:
  [natty] btrfs "grub-probe: error: unknown filesystem"

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