*** This bug is a duplicate of bug 496435 ***
https://bugs.launchpad.net/bugs/496435
If Felix' hypothesis is correct, then it's probably the old problem of
the installed core.img getting out of sync with /boot/grub. This was
generally caused by the problem described in bug 496435, which is no
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/32236372/Dependencies.txt
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grub-pc is _initrd.mod_ missing!!!
https://bugs.launchpad.net/bugs/434485
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ubuntu-b