Hi there,

Thank you for taking the time to report bugs and trying to make Ubuntu
Server better.

According to the information you have provided, it seems that the reason
why it failed to upgrade is because one of the parameters can not
contain the ' '(space) character in it:

newaliases: warning: valid_hostname: invalid character 32(decimal):
Front Desk

So, this means that you would have to change the parameter accordingly
to not to have any space characters in it. Once you change it, you
should be able to do the following to complete the installation:

sudo dpkg --configure -a

Please, let us know how it goes.

Cheers,

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

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https://bugs.launchpad.net/bugs/774541

Title:
  package postfix 2.8.2-1ubuntu1 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 75

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