The package golang-github-alexflint-go-filemutex 1.1.0-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/golang-github-alexflint-go-filemutex -- More information about golang-github-alexflint-go-filemutex: http://pkg.kali.org/pkg/golang-github-alexflint-go-filemutex