Thanks for your report.
This is very similar to bug 432964. Check that there's a file called 
/etc/gshadow.lock, and possibly /etc/shadow.lock, /etc/passwd.lock too; if 
that's the case, remove them (no risk), and retry. The problem might come from 
a crash while using the guest session: do you remember such a situation?

** Package changed: adduser (Ubuntu) => shadow (Ubuntu)

** Changed in: shadow (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- NTP client fails to install
+ ntp failed to install/upgrade: useradd: cannot lock /etc/passwd; try again 
later.

-- 
ntp failed to install/upgrade: useradd: cannot lock /etc/passwd; try again 
later.
https://bugs.launchpad.net/bugs/488641
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