package amavisd-new-postfix 1:2.6.5-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Jim P]

fails on all updates; unknown parameter. I need a beginner response to fix.

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: amavisd-new-postfix 1:2.6.5-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic i686
Architecture: i386
Date: Fri Sep 23 23:36:21 2011
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
SourcePackage: amavisd-new
Title: package amavisd-new-postfix 1:2.6.5-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to natty on 2011-05-19 (128 days ago)

[Dave Walker (davewalker)]

Thanks for the bug report.

An extract from the log states:
Starting amavisd: The value of variable $myhostname is "jim-laptop", 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).

Therefore marking invalid.

Thanks.