i also getting this message when updating {- Status code: 404 for http://ftp.byfly.by/pub/fedoraproject.org/linux/releases/23/Everything/x86_64/os/repodata/repomd.xml (IP: 82.209.230.71)
Error: Failed to download metadata for repo ‘ftp.byfly.by_pub_fedoraproject.org_linux_releases_23_Everything_x86_64_os_’: Cannot download repomd.xml
Try
sudo dnf clean all
then again
sudo dnf update
Hey, wait.
releases/23
Are you still using Fedora Linux 23??