Actually, to be honest on another reading I don't see how the existing warning
when you try to do this isn't clear:
Your root filesystem is an XFS filesystem. This is likely to cause problems
with the GRUB bootloader used by default with this installer; you might
experience problems installing or booting GRUB.
You should use a small /boot partition with another filesystem, such as ext3.
Use unrecommended XFS boot filesystem?
I'm not saying it's not a bug, but I think we can consider it not
release-critical. Matt?
Actually, to be honest on another reading I don't see how the existing warning
when you try to do this isn't clear:
Your root filesystem is an XFS filesystem. This is likely to cause problems
with the GRUB bootloader used by default with this installer; you might
experience problems installing or booting GRUB.
You should use a small /boot partition with another filesystem, such as ext3.
Use unrecommended XFS boot filesystem?
I'm not saying it's not a bug, but I think we can consider it not
release-critical. Matt?