You have an invalid hostname.
chuck
** Changed in: postfix (Ubuntu)
Status: New => Won't Fix
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package postfix 2.7.0-1 failed to install/upgrade: subprocess installed
post-installation script returned error exit status 75
https://bugs.launchpad.net/bugs/581196
You received this bug not
** Attachment added: "AptOrdering.txt"
http://launchpadlibrarian.net/48531313/AptOrdering.txt
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/48531314/Dependencies.txt
** Attachment added: "Df.txt"
http://launchpadlibrarian.net/48531315/Df.txt
** Attachment added: