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From: "Thomas Mueller" <mueller6722@twc.com>
To: freebsd-questions@freebsd.org 
CC: Olaoluwa Omokanwaiye <laoluomoks@gmail.com>
Subject: Re: Hi, a dual booting and printing question
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> Hi,
> Pls what do I do when I am unable to log in to my free BSD. I misconfigured
> the xdm and it's not allowing me to log in.
> I can't even work from the terminal because the ctrl alt fxn keys are not
> responding. Once the system starts it goes to the xdm and hangs. I thought
> to use enlightenment desktop but alls not functioning.
        
> I tried booting into single user mode to edit the troubled file but all are
> only readable and not rw.
        
> Help
        
> Ola

When you boot into single-user mode in FreeBSD or NetBSD, root is read-only.

You can remount root read-write with
mount -uw /

Tom