[Bug 989907] Re: package postfix 2.9.1-4 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 75

[Clint Byrum]

Hi Christopher. Error code 75 means that postfix cannot use your
hostname for mail purposes. This is by design. Please check
/etc/hostname or /etc/mailname and ensure that they are valid hostnames.
Your home router or ISP may have assigned you a hostname which is not
suitable for use by a mail server. You can workaround it with 'sudo
dpkg-reconfigure postfix' and entering a manual mail name.

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

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Title:
  package postfix 2.9.1-4 failed to install/upgrade: ErrorMessage:
  subprocess installed post-installation script returned error exit
  status 75

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