The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file has an unsupported filetype

I am running Debian 10. I have been getting following error while updating repositories for long time: $ sudo apt update Hit:1 http://security.debian.org buster/updates InRelease Hit:2 http://deb.debian.org/debian buster InRelease Hit:3 http://deb.debian.org/debian buster-updates InRelease Reading package lists... Done Building dependency tree Reading state information... Done All packages are up to date. W: http://security.debian.org/dists/buster/updates/InRelease : The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file has an unsupported filetype. W: http://deb.debian.org/debian/dists/buster/InRelease : The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file has an unsupported filetype. W: http://deb.debian.org/debian/dists/buster-updates/InRelease : The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file has an unsupported filetype. How do I get read of this warning regarding keys? [Here](https://bin.disroot.org/?4f877d71ea1d713d#ArxxtUUJ1i5hJxYv96ySMhJTGoX7cQ8ufV6gpBTYkiNe) is the content of /etc/apt/sources.list Ask in comment if more information is required.