Your CUPS error_log contains

X [06/Jul/2012:14:05:05 +0300] No valid Listen or Port lines were found
in the configuration file.

This means that your CUPS configuration file /etc/cups/cupsd.conf is
broken and this prevents CUPS from starting after the update.

To get CUPS going again, move the broken config file away and let the
default version get reinstalled:

sudo mv /etc/cups/cupsd.conf ~
apt-get download cups
sudo dpkg -i --force-confmiss cups_*.deb

Note that you have to redo all manual changes in cupsd.conf then (check
the original file ~/cupsd.conf). Print queue definitions are not in
cupsd.conf and therefore stay conserved.

If you use some program for changing your CUPS configuration and if it
breaks again after using the program again, report a bug in that
program.

Reopen this bug if the problem reappears after restoring the default
configuration as explained above.


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

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https://bugs.launchpad.net/bugs/1021679

Title:
  package cups 1.5.3-0ubuntu1 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 1

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