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Ubuntu eror updating

 
agus hendrayana
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How to fix this trouble

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://deb.opera.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A2019EA84E7532C8

please help me..
 
Karthik Shiraly
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Try this:
1. First update your package index using cmd line


Once that's done, then start upgrade.
 
agus hendrayana
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OK thank.. it's working now
 
agus hendrayana
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