Looks like a service started before CUPS during boot has taken CUPS'
port 631. Can you run the command

sudo lsof -i :631

Usually such services are not fixed on port 631 but take a random port.
So after a reboot of your system, CUPS should return to work normally.
So repooting and running

sudo apt-get install -f
sudo apt-get dist-upgrade

all should be OK again.


** Package changed: cups (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: Fix Committed => Incomplete

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https://bugs.launchpad.net/bugs/800424

Title:
  package cups 1.4.6-5ubuntu1.2 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 1

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