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this is what happens when I try to update, update manager (Requires installation of untrusted packages) how can I fix this please

user299050
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    Enable Repositories by `sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) main universe restricted multiverse"` in Terminal and then `sudo apt-get update` – Pandya Jun 30 '14 at 03:51

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