[Bug 1011089] Re: package postfix 2.9.1-5 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1

[Robie Basak]

>From log:

Setting up postfix (2.9.1-5) ...
Installing new version of config file /etc/init.d/postfix ...
Installing new version of config file /etc/postfix/post-install ...
Installing new version of config file /etc/postfix/postfix-files ...
Installing new version of config file /etc/ufw/applications.d/postfix ...
Installing new version of config file /etc/resolvconf/update-libc.d/postfix ...
Lege Gruppe »postfix« (GID 132) an ...
groupadd: /etc/gshadow konnte nicht gesperrt werden; versuchen Sie es später noch einmal.
addgroup: »/usr/sbin/groupadd -g 132 postfix« gab den Fehlercode 10 zurück. Programmende.
dpkg: error processing postfix (--configure):
 subprocess installed post-installation script returned error exit status 1

"/etc/gshadow could not be locked, try again later."

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https://bugs.launchpad.net/bugs/1011089

Title:
  package postfix 2.9.1-5 failed to install/upgrade: ErrorMessage:
  subprocess installed post-installation script returned error exit
  status 1

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