Comment 19 for bug 42947

I update postfix today and i had that error:

Running newaliases
 * Stopping Postfix Mail Transport Agent postfix
postfix/postfix-script: fatal: usage: postfix start (or stop, reload, abort, flush, check, set-permissions, upgrade-configuration)
                                                                                                                                  [fail]
invoke-rc.d: initscript postfix, action "restart" failed.
dpkg: error processing postfix (--configure):

The problem was that the upgrade did not replace /etc/postfix/postfix-script.
After replacing it manually from the postfix .deb the update process worked.