This is probable because on an incorrect device.map
and your grub2 version is pretty old. This shouldn't happen anymore.
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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package grub-ieee1275 1.96+20080203-1ubuntu2 failed to install/upgrade:
subprocess post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/279116
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