HELP upgrade 10.3 to 11.2, now it won't boot!

William Dudley wfdudley at
Wed Sep 12 01:28:27 UTC 2018

This was a straight upgrade using freebsd-upgrade.  I don't do source
builds anymore, since freebsd-upgrade was "reliable".

What is the boot loader expecting to find in /etc/fstab ?

I can boot live media and fix that, if I know what to change it to.

Bill Dudley

This email is free of malware because I run Linux.

On Tue, Sep 11, 2018 at 9:24 PM, Rick Miller <vrwmiller at> wrote:

> On Tue, Sep 11, 2018 at 8:27 PM William Dudley <wfdudley at> wrote:
>> I started the upgrade from 10.3 to 11.2.
>> I followed all the instructions and all "looked OK" until I got to
>> the reboot.
>> Now the system won't boot.
>> copied from a photo of the screen:
>> Mounting from ufs:/dev/ad01e failed with error 19.
>> (something)dev variables:
>> (something)ufs.root.mountfrom=ufs:/dev/ad0s1e
>> (something)ufs.root.mountfrom.options=rw
>> (something)ual root filesystem specification:
>> <fstype>:<device> [options]
>>       Mount <device> using filesystem <fstype>
>>       and with the specified (optional) option list.
>> e.g. ufs:/dev/da0s1a
>>        zfs:tank
>>        cd9660:/dev/cd0 r0
>> and obviously, more stuff intended to be helpful printed below that.
> Ugh! This error is the bane of my existence! AFAIK, mountroot() error 19
> means the root filesystem cannot be found. vfs.root.mountroot, which is
> expected to contain the root filesystem, is derived from /etc/fstab unless
> explicitly defined in loader(8)*. Theoretically, you can boot to whatever
> root filesystem you may have by defining vfs.root.mountfrom at this prompt.
> Entering '?' at this prompt outputs a list of geom managed disk devices.
> The root filesystem is expected to be on one of these.
> It's unclear how the upgrade was attempted (e.g. freebsd-update(8) or
> source update). I've observed this error most when PXE booting bootonly
> media, never during an OS upgrade.
> You may be able to resolve it by booting the system to external media and
> mounting the disk with the root filesystem and modifying /etc/fstab.
> *
> --
> Rick

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