OK, so I'm afraid your GRUB installation was simply misconfigured. It
was set up to upgrade the boot loader on /dev/sda every time you
upgraded, but according to your comment on IRC you want it on /dev/sdb.
The effect of this was that you had an old partial copy of GRUB on
/dev/sdb, which eventually broke due to otherwise-innocuous changes (the
ABI between a GRUB core image and GRUB modules is not fixed).
You should run 'sudo dpkg-reconfigure grub-pc' and make sure the disk
you want to boot from is selected; I would in general recommend
selecting all the non-removable disks in your system.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/960092
Title:
Latest update renders system unbootable "error: no such partition"
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