Comment 8 for bug 757631

Thanks for the feedback Colin. Here's another workaround that works better. Perhaps it can help somebody to put together a proper fix.

In /etc/grub.d/10_linux, replace this line:

if [ "x`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2>/dev/null || true`" = xbtrfs ]; then

with these two lines:

#if [ "x`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2>/dev/null || true`" = xbtrfs ]; then
if [ "x`stat -f --printf=%T /`" = xbtrfs ]; then