Last night my internet connection was slow so I canceled Gimp installation (4.5 Mb/53Mb). But today when I try to click on Gimp install button in Ubuntu Software Center, this error came up "Requires installation of untrusted packages". What should I do now?
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nope.sudo apt -get update solved my problem. – kamal Dec 22 '15 at 04:23
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What do you think the first answer of that question is? – muru Dec 22 '15 at 04:24
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Close software-center and then open a terminal and run the following command:
sudo apt-get update
Then, open software and try the install again and you should not see the same error.

mchid
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