If you know you are always using LVM or RAID and the fix in post #34 seems to 
be too complicated to apply, here's a much easier one:
Edit /etc/grub.d/00_header
At line 118 (at least on my Linux Mint 17 that's the line number) simply put a 
# in front of the "if [ -n "\${have_grubenv}" ] ...". This will always comment 
out that line from /boot/grub/grub.cfg
Run update-grub    <--- this is important
Check /boot/grub/grub.cfg to make sure the "if ..." is commented out in the 
recordfail function
Reboot and test

Of course the fix in post #34 or something similar is what Grub should
do in general, but you don't really need all that if you are currently
using RAID or LVM and have no plans switching.

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https://bugs.launchpad.net/bugs/1274320

Title:
  Error: diskfilter writes are not supported

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