Gstreamer SDK installation issue in Ubuntu 12.04

[mmisas]

Hello,
I am trying to install Gstreamer SDK on my Ubuntu Linux machine 12.04. I
have followed the below steps that are documented in the
http://docs.gstreamer.com/display/GstSDK/Installing+on+Linux.

Steps followed:
1] Downloaded the gstreamer-sdk.list from the location
2] sudo cp gstreamer-sdk.list /etc/apt/sources.list.d/
3] wget -q -O - http://www.freedesktop.org/software/gstreamer-sdk/sdk.gpg |
sudo apt-key add -
4] sudo apt-get update

But I am always met with this error. Please can someone help me to fix this
problem. Thanks.

Ign http://www.freedesktop.org ./ Release.gpg
Ign http://www.freedesktop.org ./ Release
Err http://www.freedesktop.org ./ Packages
  Undetermined Error
Ign http://www.freedesktop.org ./ Translation-en_US
Ign http://www.freedesktop.org ./ Translation-en
Fetched 948 B in 10min 1s (1 B/s)
W: GPG error: http://ppa.launchpad.net precise Release: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY A1715D88E1DF1F24
W: GPG error: http://ppa.launchpad.net precise Release: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY EB9B1D8886F44E2A
W: GPG error: http://ppa.launchpad.net precise Release: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY C2518248EEA14886
W: Failed to fetch
http://www.freedesktop.org/software/gstreamer-sdk/data/packages/ubuntu/precise/i386/./Packages 
Undetermined Error

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




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