Comment 8 for bug 523896

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Mathias Gug (mathiaz) wrote : Re: package postfix 2.6.5-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

The root of the problem is:

useradd: cannot lock /etc/passwd; try again later.

Have you changed /etc/passwd? What are the permissions on the file?

This is not a bug in postfix.