I guess this is not a bug. Please read the follow link and try to create a 
/boot partition within the lba limit.
http://wiki.linuxquestions.org/wiki/GRUB#Error_18_on_Dual_Boot_Systems_Using_a_Single_Hard_Drive

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GRUB error 18  will not boot ubuntu or windows
https://bugs.launchpad.net/bugs/386369
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