install FreeBSS 6 from an existing filesystem?

[Torfinn Ingolfsen]

On Sat, 11 Feb 2006 16:42:01 -0600
"Matthew D. Fuller" <fullermd at over-yonder.net> wrote:

> Actually, the easiest thing to do in this case is probably to label
> and newfs the stuff for 6, and install it manually from the 4
> partition.  You won't get UFS2 filesystems, but...

But that is one of the things I want. Surely there must be a way to get
this installation working without ripping the disk out of the laptop (a
tedious operation).

I tried manually mounting partitions from the fixit (floppy) shell.
My new partitions are 
/dev/ad0s2a	/
/dev/ad0s2b	swap
/dev/ad0s2d	/var
/dev/ad0s2e	/tmp
/dev/ad0s2f	/usr

but when I issue 'mount /dev/ad0s2a /mnt', I get the message
mount: /dev/ad0s2a: Operation not permitted

Huh?
-- 
Yours,
Torfinn Ingolfsen,
Norway