can't update - Opera NO_PUBKEY

[stevef]

It looks like opera changed their key set up.
It is discussed on the opera forum

For example
https://forums.opera.com/topic/64596/no_pubkey-24a1004b1f11dcc9-message-when-trying-to-update/

[dduran1210]

=========================== Install Updates Error log =========================== Install Updates could not fetch the package cache information lists. Go to https://www.linuxliteos.com/forums/ and paste the log below into a new or existing thread for assistance. ============ Log =========== Hit:1 http://repo.linuxliteos.com/linuxlite emerald InRelease Hit:2 http://us.archive.ubuntu.com/ubuntu focal InRelease Hit:3 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease Hit:4 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease Hit:5 http://archive.canonical.com/ubuntu focal InRelease Hit:6 http://ppa.launchpad.net/christian-boxdoerfer/fsearch-stable/ubuntu focal InRelease Hit:7 http://security.ubuntu.com/ubuntu focal-security InRelease Hit:8 https://dl.google.com/linux/chrome/deb stable InRelease Hit:9 http://ppa.launchpad.net/mozillateam/ppa/ubuntu focalInRelease Get:10 https://deb.opera.com/opera-stable stable InRelease [2,590 B] Err:10 https://deb.opera.com/opera-stable stable InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 24A1004B1F11DCC9 Reading package lists... W: GPG error: https://deb.opera.com/opera-stable stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 24A1004B1F11DCC9 E: The repository 'https://deb.opera.com/opera-stable stable InRelease' is not signed.