Package: debian-installer
Version: 20121114

I tried to install Debian/testing on an AMD E2-1800 device with UEFI using the 
latest snapshot of the daily amd64 Debian/testing netinstall builds. I noticed 
that the installation of grub failed, because grub-efi-amd64 couldn't be 
installed correctly. The following error message showed up in the logs (sda2 
is /boot with btrfs):

/usr/sbin/grub-probe: Error: unknown filesystem.
Auto-detection of a filesystem of /dev/sda2 failed.
Try with --recheck.
If the problem persists please report this together with the output of 
"/usr/sbin/grub-probe --device-map="/boot/grub/device.map" --target=fs -v 
/boot/grub" to <bugs-g...@gnu.org>


I played around with different partition layouts to locate the error and 
noticed that this error always appears when I try to use a seperate partition 
for /boot which is formatted with btrfs.
Constrastingly having no seperate /boot-partition, but / formatted with btrfs 
works. A seperate /boot-partition with another file system like ext4 works too.

Regards,
Daniel


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