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Ordinarily I when I click to select a software package in the Ubuntu Software Center, I see the More Info button displayed near of the left edge of the window and the Install button displayed near of the right edge of the window. However recently the Install button does not appear anymore.

What can I do to install software?

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Sometimes the Install button does not appear if the software is trialware, for example the Circular Chaos game. So just click on the More Info button, and it will bring you to another pane that has a description of the software package, sometimes also a screenshot of the package and a Buy button on the right-hand side of the window. –  karel Oct 22 '13 at 0:26
Please note: the install button is not missing only sometimes. It is missing for each and every SW package! –  jolexin Oct 22 '13 at 22:13

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