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Date: Mon, 24 Jun 2013 06:47:28 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Doug Hardie <bc979@lafn.org>
Subject: Re: Boot Loader Issue
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On Sun, 23 Jun 2013, Doug Hardie wrote:

>
> On 23 June 2013, at 20:39, Warren Block <wblock@wonkity.com> wrote:
>
>> On Sun, 23 Jun 2013, Doug Hardie wrote:
>>
>>> I had to convert a system from GPT to MBR.  All went fine till I tried to reboot the system.  It gets to mountroot and dies trying to mount from ufs:/dev/ada0p2.  That won't work.
>>
>> The loader should be getting that information from /etc/fstab.  Have the entries there been changed?
>
> That was the problem.  The system used GPT before and I can't believe I forgot to update fstab.  That was a really dumb mistake.

Not really, the only reason it occurred to me was because I've forgotten 
to do it many, many times.

As Polytropon points out, labels can help avoid the problem.  In this 
case, it would have had to be a UFS label on the filesystem:

http://www.wonkity.com/~wblock/docs/html/labels.html