Comment 11 for bug 46223

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Tormod Volden (tormodvolden) wrote : Re: [DAPPER] update-grub doesn't work correctly with raid partitions

Interesting that Dell got bitten by this, they are probably not using RAID like in this bug. Congratulations with your new Ubuntu Dell, Lonnie :)
The convert() and find_device() functions inside update-grub are not pretty. They are also duplicated in grub-install. I hope it will be all rewritten in grub2.

IMHO the #groot value should have been determined and written out by the installer program or manually set once, and then not be messed around with each time update-grub is run. If grub needs to autodetect it on its first run, it should ask the user to verify (and the autodetection should be separated out and possibly be overridden by command options).