FC16 > FC17: did preupgrade fail?

[sean darcy]

On an FC16 box i just ran preupgrade-cli.

It ends on a down note:

  Spawning worker 0 with 1682 pkgs
Workers Finished
Gathering worker results

Saving Primary metadata
Saving file lists metadata
Saving other metadata
Generating sqlite DBs
Sqlite DBs complete
Preparing system to boot into installer
DEBUG /sbin/grubby --title="Upgrade to Fedora 17 (Beefy Miracle)" 
--remove-kernel="/boot/upgrade/vmlinuz" 
--add-kernel="/boot/upgrade/vmlinuz" --initrd="/boot/upgrade/initrd.img" 
--args="preupgrade repo=hd::/var/cache/yum/preupgrade 
ks=hd:UUID=dad91fb5-5749-4221-a145-ff6361a4bb11:/upgrade/ks.cfg 
stage2=hd:UUID=dad91fb5-5749-4221-a145-ff6361a4bb11:/upgrade/squashfs.img"
sh: /sbin/grub: No such file or directory
/bin/echo: write error: Broken pipe
All finished. The upgrade will begin when you reboot.

Why's it looking for /sbin/grub? Should it have found it? And the write 
error??

Doesn't give me a good feeling about starting the upgrade!

sean