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?
** Changed in: postfix (Ubuntu)
Status: New => Incomplete
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package postfix 2.6.5-3 failed to install/upgrade: subprocess installed
post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/537099
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