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W: GPG error: http://deb.opera.com stable InRelease: The following signatures were invalid: KEYEXPIRED 1435908620 KEYEXPIRED 1435908620 KEYEXPIRED 1435908620 The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 63F7D4AFF6D61D45
trevor@trevor-Latitude-D620:~$
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1follow below link http://askubuntu.com/questions/13065/how-do-i-fix-the-gpg-error-no-pubkey – khanthegeek Jul 07 '15 at 11:36
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mark as a correct answer and vote it please – khanthegeek Jul 07 '15 at 12:10
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@khanthegeek. Please also flag duplicates as duplicates in the future... ;-) – Fabby Jul 07 '15 at 13:34