To enable the extra repositories:
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Open System->Administration->Software Properties .
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Select Add
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To enable the Universe repository, check the Community Maintained (Universe) button.
Note: Adding this repository will mean that the majority of the Free Software universe will be available to install on your system. This software is supported by a carefully selected group of volunteers within the Ubuntu Community, but is not supported by the core Ubuntu development team and may not include security updates.
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To enable the Multiverse repository, check the Non-free (Multiverse) button.
Warning: Adding this repository will mean that software which has been classified as non-free will be available to install on your system. This software may not be permitted in some jurisdictions. When installing each package from this repository, you should verify that the laws of your country permit you to use it. Again, this software may not include security updates.
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Click Close to save your changes and exit.
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To apply your changes, select Reload.
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