How do I downgrade a package?
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Start "Synaptic Package Manager"
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Type in "firefox" in the quick filter and highlight it in the search result (the one w/ the green box next to the package name indicating that it is already installed on your computer)
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Select from the menubar "Package" -> "Force Version"
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Select 4.0 from the dropped down list "4.0+nobinonly-0ubuntu3 (natty)" and click "Force Version"
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"Apply" changes
