That's because grub-pc fails to install:
Setting up grub-pc (1.96+20080203-1ubuntu2) ...
Generating core.img
grub-probe: error: cannot find a GRUB drive for /dev/sdb1.
Auto-detection of a filesystem module failed.
Please specify the module with the option `--modules' explicitly.
dpkg: error processing grub-pc (--configure):
subprocess post-installation script returned error exit status 1
** Changed in: grub2 (Ubuntu)
Status: New => Confirmed
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grub-pc failed to upgrade
https://bugs.launchpad.net/bugs/251533
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