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I've got a problem when I make sudo apt-get update. It was the error in my attached picture. I've read many solutions like my error. But I can't solve it.

My OS is Ubuntu 14.04.4 LTS.

enter image description here

W: GPG error: http://us.archive.ubuntu.com trusty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
kophyosithu
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  • Check the following question https://askubuntu.com/questions/1877/what-is-the-easiest-way-to-resolve-apt-get-badsig-gpg-errors – Dan Jun 01 '17 at 06:51
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    Could you please post text files, dialogue messages, and program output listings as text, not as images? To achieve the latter two you can either 1) select, copy & paste the dialogue text or terminal content or 2) save the program output to a file and use that. Longer listings (the editor will tell you what's too long) should be uploaded to a pastie service and linked to in the question. Thanks. – David Foerster Jun 01 '17 at 12:57

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