Are you trying to install pre-requisites for NS-3? To build NS-3?
this error is shown when i try to install pYViz,,any one know the reason?
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:) it is clear from the error the package is missing sudo install it and you are good to go.
sudo apt-get install python-gnome2-desktop python-rsvg ipython
Always search before asking thats how you learn, directly asking imply you want spoon feeding like traditional COMSIAN.