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Problem :

I am facing following ubantu issue
updating from such a repository can't be done securely, and is therefore disabled by default.
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1 Answer

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Solution :

You should try to set options in your sources.list which should be located at /etc/apt/sources.list as follows:

deb [trusted=yes] jessie main

This trusted option is responsible for turning off the GPG check.

Now you can either edit the file within the terminal with vim  or any non-terminal editor like gedit.

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