Comment 1 for bug 780013

this is what I get
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu lunar InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu lunar-updates InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu lunar-backports InRelease
Hit:5 http://security.ubuntu.com/ubuntu lunar-security InRelease
Get:6 https://deb.opera.com/opera-stable stable InRelease [2,590 B]
Err:6 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
Fetched 2,590 B in 1s (2,826 B/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
47 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. 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
W: Failed to fetch https://deb.opera.com/opera-stable/dists/stable/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 24A1004B1F11DCC9
W: Some index files failed to download. They have been ignored, or old ones used instead.
michael@michael-Satellite-C55-A:~$
I attempted all fixes I could find online, including purging deb.opera.com but it will not allow me to purge stating the same error as above over and over again.