update-grub says /usr is broken
update-grub (which used to sit under /sbin) would tell me
“Your /usr is broken, please fix it before call this wrapper!”
I checked the contents of the script, and saw it would check for the existence of /usr/sbin/update-grub and run it, or if it wasn’t there exit with the above message.
Thanks to ubuntuforums thread #1052171 I found out that /usr/sbin/update-grub is contained in the package grub-pc. Installing it removed grub, then asked me a few questions. Now it works again…

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