user deletion problem

[PM]

> This might be a little reckless without more information on why that lock
> file is there and empty, but if this were me, I would just delete that lock
> file and see what happens.  (If you break it, you get to keep both halves,
> so it's all good anyhow)
>
> sudo rm /etc/gshadow.lock
>
> If you really want to be safe, you can reboot in single user/recovery mode
> before doing this.  But I can't imagine what process would legitimately be
> keeping a lock on the gshadow file, and I think this must just be something
> left over from a very badly timed unclean shutdown.
>

sudo rm /etc/gshadow.lock

Only this command worked! I just deleted gshadow.lock file and the problem
got solved! However I don't know about its creation (why did it get
created?) and the purpose of it after being getting created!

Thx.
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