Thanks for your report.
The relevant message is
=====
Errors found in /tmp/dpkg-error/506797/DpkgTerminalLog.gz
Setting up dovecot-postfix (1:1.1.11-0ubuntu11) ...
* Restarting IMAP/POP3 mail server dovecot
Info: If you have trouble with authentication failures,
enable auth_debug setting. See http://wiki.dovecot.org/WhyDoesItNotWork
...done.
* Stopping Postfix Mail Transport Agent postfix
...done.
* Starting Postfix Mail Transport Agent postfix
postfix: fatal: file /etc/postfix/main.cf: parameter default_privs: unknown
user name value: nobody
...fail!
invoke-rc.d: initscript postfix, action "restart" failed.
dpkg: error processing dovecot-postfix (--configure):
subprocess installed post-installation script returned error exit status 1
====
Please fix your postfix configuration and try performing th upgrade
again. I'm closing this report since it's not a bug.
Don't hesitate to submit any new bug.
** Changed in: dovecot (Ubuntu)
Status: New => Invalid
--
package dovecot-postfix 1:1.1.11-0ubuntu11 failed to install/upgrade:
subprocess installed post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/506797
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