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I am using Ubuntu 12.04 LTS. When I try to open a video in Firefox 25 browser, it is showing like install flash media plugin. When I click the button "install plugin" it is not installing.

Please help on with this one. I am having this problem since the last 5 days.

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Open your Terminal and run this command:

sudo apt-get update && sudo apt-get install flashplugin-installer
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