The package golang-github-safchain-ethtool 0.0~git20210803.9aa261d-2 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/golang-github-safchain-ethtool -- More information about golang-github-safchain-ethtool: http://pkg.kali.org/pkg/golang-github-safchain-ethtool