I reproduced this bug by adding an additional menuentry in file
'/etc/grub.d/40_custom'.

Previous version of the file (no bug):

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.


New version of the file, producing the bug:

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.

menuentry ‘Windows 10 msdos2′ {
set root='(hd0,msdos2)’
chainloader +1
}


Finally, I solved the bug by creating a new file '/etc/grub.d/42_custom' and 
put the new menuentry there...

Hope this helps.

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https://bugs.launchpad.net/bugs/775377

Title:
  grub-mount assert failure: *** glibc detected *** grub-mount: free():
  invalid next size (fast): 0x08d25b98 ***

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