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when i click ok to software update it shows 'This requires installing packages from unauthenticated sources' please help me how to get out from this problem

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  • Open a terminal and run sudo apt-get update and sudo apt-get upgrade and then try again.
    – Rohith Madhavan
    Dec 3, 2014 at 3:43

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Please try the below command,

sudo apt-get clean

sudo apt-get update

Then use this command to install,

sudo apt-get upgrade

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