Comment 5 for bug 801338

Terminal output of sudo apt-get upgrade for installation of amavis-new-postfix package:
Setting up amavisd-new-postfix (1:2.6.5-0ubuntu3.2) ...
Selected policy name, policy-spf, already in master.cf. Master.cf not updated.
Selected service name, smtp-amavis, or smtpd port, 10025, already in master.cf. Master.cf not updated.
 * Stopping Postfix Mail Transport Agent postfix [ OK ]
 * Starting Postfix Mail Transport Agent postfix [ OK ]
Stopping amavisd: (not running).
Starting amavisd: The value of variable $myhostname is "ranch-house", but should have been
  a fully qualified domain name; perhaps uname(3) did not provide such.
  You must explicitly assign a FQDN of this host to variable $myhostname
  in /etc/amavis/conf.d/05-node_id, or fix what uname(3) provides as a host's
  network name!
(failed).
invoke-rc.d: initscript amavis, action "restart" failed.
dpkg: error processing amavisd-new-postfix (--configure):
 subprocess installed post-installation script returned error exit status 1
Setting up google-chrome-stable (21.0.1180.89-r154005) ...
Setting up thunderbird (15.0+build1-0ubuntu0.12.04.1) ...
Setting up thunderbird-globalmenu (15.0+build1-0ubuntu0.12.04.1) ...
Setting up thunderbird-gnome-support (15.0+build1-0ubuntu0.12.04.1) ...
Setting up thunderbird-locale-en (1:15.0+build1-0ubuntu0.12.04.1) ...
Setting up thunderbird-locale-en-us (1:15.0+build1-0ubuntu0.12.04.1) ...
Setting up xserver-xorg-input-synaptics (1.6.2-1ubuntu1~precise2) ...
Processing triggers for menu ...
Errors were encountered while processing:
 amavisd-new-postfix
W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ precise/partner i386 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_precise_partner_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
E: Sub-process /usr/bin/dpkg returned an error code (1)