I was also affected by this, my Windows installation was not recognized
anymore. Mounting of NTFS partitions with FUSE/ntfs-3g also did not
work. I straced the mount command and found:

[pid 29143] execve("/bin/mount", ["/bin/mount", "--no-canonicalize", "-i", 
"-f", "-t", "fuseblk", "-o", "rw,nosuid,nodev,allow_other,blks"..., 
"/dev/sda2", "/media/windows"], [/* 21 vars */]) = 0
[...]
[pid 29130] write(2, "/bin/mount: unrecognized option "..., 52) = -1 EBADF (Bad 
file descriptor)
[pid 29130] write(2, "Usage: mount -V                 "..., 1509) = -1 EBADF 
(Bad file descriptor)

Trying the mount command manually showed, that my "mount" did not
support option "--no-canonicalize". It came from "loop-aes-
utils-2.16.2-1"...

As a work-around I removed the package "loop-aes-utils" to make the
original "mount" effective, mounting NTFS partitions and "update-grub"
worked again. The version of "mount" in "loop-aes-utils" seems to be too
old for "ntfs-3g".

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https://bugs.launchpad.net/bugs/756663

Title:
  os-prober does not detect other installed systems

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