[Bug 880514] Re: package postfix 2.8.5-2~build1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 75

[Clint Byrum]

Hi Dave D, error code 75 means that your hostname or /etc/mailname are
invalid.Check /etc/hostname, and /etc/mailname, and make sure it is made
up of just letters, numbers, dashes (-) or periods (.), and starts with
a letter only. Some routers and service providers give back invalid
hostnames when acquiring a dynamic address.

** Changed in: postfix (Ubuntu)
       Status: New => Invalid

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Title:
  package postfix 2.8.5-2~build1 failed to install/upgrade:
  ErrorMessage: subprocess installed post-installation script returned
  error exit status 75

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