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I'm trying to look at a package, e.g. Emerald themes.

It appears in the list but when I go to look at it, this message appears:

There isn't a software package called "emerald" in your software sources.

What software sources do i need to add? And if they aren't already included then why does the package appear on the list?

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This is actually a bug in Software Center:

Emerald has been removed from Ubuntu due to the package being in bad shape. However, you can try to manually download it from here:

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