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Date:      Wed, 16 Aug 2017 09:26:41 +0200
From:      Polytropon <freebsd@edvax.de>
To:        Kurt Buff <kurt.buff@gmail.com>
Cc:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: FUBAR on an upgrade - need some help
Message-ID:  <20170816092641.038c1860.freebsd@edvax.de>
In-Reply-To: <CADy1Ce4Su5NDequMC3t10Suut6iSsw=zT0RK1h_GpRxnQQsFEQ@mail.gmail.com>
References:  <CADy1Ce4Su5NDequMC3t10Suut6iSsw=zT0RK1h_GpRxnQQsFEQ@mail.gmail.com>

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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).




-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...



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