Download error installing any package with kpackagekit

[David Glover]

Attempting to install any package fails with the following error. (Package name changes based on what you are trying to install.)

Installing using apt-get works correctly.

"The package download failed.
Please check your network connectivity.

E: Error http://gb.archive.ubuntu.com/ubuntu/ natty-updates/main libcurl3 amd64 7.21.3-1ubuntu1.2
Something wicked happened resolving ':http' (-5 - No address associated with hostname)"

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: kpackagekit 0.6.3.3-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: wl
Architecture: amd64
Date: Tue Jul 5 21:05:09 2011
ExecutablePath: /usr/bin/kpackagekit
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
ProcEnviron:
 LANGUAGE=en_GB:en
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: kpackagekit
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors: (knotify4:1479): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed