Problem in installing YouTube unity lens

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http://askubuntu.com – I was trying to installing YouTube lens and scope from Ubuntu. I typed the following in the terminal: sudo add-apt-repository ppa:atareao/lenses sudo apt-get update && sudo apt-get install lens-video scope-youtube The output is: Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package lens-video (HowTos)