I am using Ubuntu 19.10.
When I click Software updater I get an error message about updating Brave:
“Unable to download updates failed to refresh cache: w: an error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https: //brave-browser-apt-release-s3.brave.com eoan InRelease: the following signatures couldn’t be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C”.
I tried changing https to http also -“Failed to download repository information”.