Confirmed according to the flashcache docs, temporary solution is to
edit grub.cfg manually (see
https://github.com/facebook/flashcache/blob/master/README-DKMS):
Known Issues:
-------------
- Right now grub-probe fails to detect the underlying root device when
booting off flashcache,
so you'll have to edit /boot/grub/grub.cfg manually.
- Because of previous point, update-grub will likely fail.
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https://bugs.launchpad.net/bugs/878582
Title:
grub-probe fails on flashcache /dev/mapper root device
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