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Step 1
Close the Firefox browser.
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Step 2
Open a terminal window in Ubuntu. The easiest way to do this is to press"Alt+F2" and type in "xterm" without the quotes.
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Step 3
Type "sudo apt-get update," without the quotes, into the terminal window. You are updating the package list with this command. Wait for the list to finish updating.
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Step 4
Type "sudo apt-get install flashplugin-nonfree," without the quotes, into the terminal window. This command retrieves and installs the flash player plug-in.
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Step 5
Verify that it works. Open Firefox and go to YouTube or some similar site and verify that the plug-in works.












