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when i try it to install from ubuntu update manager i got the folling message:-

The action would require the installation of packages from not authenticated sources. When I click on detail the followong message is appeared .So please tell me how to install this sowtware on my pc or tell me the other solution

cli-common libart2.0-cil libgconf2.0-cil libgdiplus libglade2.0-cil libglade2.0-cil-dev libglib2.0-cil libglib2.0-cil-dev libgnome-vfs2.0-cil libgnome2.24-cil libgtk2.0-cil libgtk2.0-cil-dev libgtkspell0 libmono-addins-gui0.2-cil libmono-addins0.2-cil libnunit-cil-dev libnunit2.5-cil monodevelop

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First of all you should update your list of packages.

sudo apt-get update

Thereafter try to install the packages one by one on the terminal:

sudo apt-get install xxx

Where xxx are the packages in your question.

If you haven't installed proper authentication keys look at:

Under headline "Authentication Tab" you can find the way to install them or restore the default ones.

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