error:
W: 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
reason:
pubkey expired for opera
where to look for:
sudo apt-key list
solution:
sudo apt-key del 9D1A0061
wget -O - http://deb.opera.com/archive.key | sudo apt-key add -
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