FUBAR on an upgrade - need some help

[Kurt Buff]

On Wed, Aug 16, 2017 at 12:26 AM, Polytropon <freebsd at edvax.de> wrote:
> On Tue, 15 Aug 2017 19:29:23 -0700, Kurt Buff 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
>
> The OS now has associated /dev/ada0 to the device formerly known
> as /dev/ad4, so the root partition needs to be adjusted in /etc/fstab
> from /dev/ad4s1a to /dev/ada0s1a.
>
> When in single-user mode, do this:
>
>         # mount -w /
>
> so you can write to /, then use
>
>         # vi /etc/fstab
>
> or
>
>         # ee /etc/fstab
>
> to make the required changes (for the swap partition as well).
>
> Finally reboot.
>
>
>
>> I can't seem to use vi to modify fstab.
>
> This is because the system leaves / mounted read-only when booting
> into single-user mode (and it does not mount anything than /, so if
> you have /usr on a different file system, you need to mount that
> as well).


Excellent. I've done this, and now find that wireless isn't working -
it seems that it's detecting the NIC (ath0), but something has
changed, so now I'll do some research on that.

Many thanks.

Kurt