FUBAR on an upgrade - need some help

[Jack L.]

boot into single user mode and then mount -rw / and then modify fstab

On Tue, Aug 15, 2017 at 7:29 PM, Kurt Buff <kurt.buff at gmail.com> wrote:
> I have an old Acer AspireOne netbook that's been running 10.1-RELEASE.
>
> Yesterday I upgraded it using freebsd-update to 10.2 and then to 10.3,
> and it went fine.
>
> Then I upgraded it to 11.0-RELEASE, and it failed during boot, saying
> it wanted to boot from ad4s1a, but couldn't find it.
>
> I have managed to get it into single user, and have run "df-h" and
> "gpart show", which don't agree at all. Output:
>
> # df -h
> Filesystem     Size     Used     Avail   Capacity   Mounted on
> /dev/ad4s1a    140G   36G        93G        28%    /
> devfs               1.0k    1.0k          0B      100%   /dev
>
> #gpart show
> =>         63   312581745   ada0   MBR    (149GB)
>              63   312581745        1   freebsd      [active]     (149GB
>
> =>           0   312581745   ada0s1    BSD     (149GB)
>                0   8388608               2    freebsd-swap    (4.0GB)
>     8388608    304193137           1    freebsd-ufs      (145GB)
>
> # cat /etc/fstab
> # Device            Mountpoint      FStype     Options      Dump      Pass#
> /dev/ad4s1b       none               swap         sw             0            0
> /dev/ad4s1a       /                     ufs            rw
> 1            1
>
>
> I can't seem to use vi to modify fstab.
>
> I'm a bit lost on how to recover from this. Can anyone give me a clue?
>
> Thanks,
>
> Kurt
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