the pkg key is not valid
root@localhost:~# curl -C - --no-check-certificate https://pkg.cloudflare.com/pubkey.gpg | sudo apt-key add -
curl: option --no-check-certificate: is unknown
curl: try 'curl --help' or 'curl --manual' for more information
gpg: no valid OpenPGP data found.
2 Replies
The error is in your curl command. Remove the no-check-certificate
I see