Installed the juju ppa so I could update to the 1.12.x release on my Ubuntu 13.04 x64 bit desktop.

$ sudo add-apt-repository ppa:juju/stable

$ sudo apt-get update

This gives out the error:
Fetched 12.3 kB in 13s (876 B/s)
W: Failed to fetch http://ppa.launchpad.net/juju/stable...ng/Release.gpg Something wicked happened resolving 'ppa.launchpad.net:http' (-11 - System error)

E: Some index files failed to download. They have been ignored, or old ones used instead.

Not sure why that error as I just checked launchpad for juju-hackers:

https://launchpad.net/~juju/+archive/stable

And launchpad says Ubuntu 13.04 is supported with the PPA ??