/usr/share/go-1.8/src/cmd/gofmt/ is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o755.
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/usr/share/go-1.8/src/cmd/gofmt/doc.go
/usr/share/go-1.8/src/cmd/gofmt/gofmt.go
/usr/share/go-1.8/src/cmd/gofmt/gofmt_test.go
/usr/share/go-1.8/src/cmd/gofmt/internal.go
/usr/share/go-1.8/src/cmd/gofmt/long_test.go
/usr/share/go-1.8/src/cmd/gofmt/rewrite.go
/usr/share/go-1.8/src/cmd/gofmt/simplify.go
/usr/share/go-1.8/src/cmd/gofmt/testdata/
/usr/share/go-1.8/src/cmd/gofmt/testdata/comments.golden
/usr/share/go-1.8/src/cmd/gofmt/testdata/comments.input
/usr/share/go-1.8/src/cmd/gofmt/testdata/composites.golden
/usr/share/go-1.8/src/cmd/gofmt/testdata/composites.input
/usr/share/go-1.8/src/cmd/gofmt/testdata/crlf.golden
/usr/share/go-1.8/src/cmd/gofmt/testdata/crlf.input
/usr/share/go-1.8/src/cmd/gofmt/testdata/emptydecl.golden
/usr/share/go-1.8/src/cmd/gofmt/testdata/emptydecl.input
/usr/share/go-1.8/src/cmd/gofmt/testdata/import.golden
/usr/share/go-1.8/src/cmd/gofmt/testdata/import.input
/usr/share/go-1.8/src/cmd/gofmt/testdata/ranges.golden
/usr/share/go-1.8/src/cmd/gofmt/testdata/ranges.input
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/usr/share/go-1.8/src/cmd/gofmt/testdata/rewrite2.input
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/usr/share/go-1.8/src/cmd/gofmt/testdata/rewrite3.input
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/usr/share/go-1.8/src/cmd/gofmt/testdata/stdin6.input
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/usr/share/go-1.8/src/cmd/gofmt/testdata/typeswitch.golden
/usr/share/go-1.8/src/cmd/gofmt/testdata/typeswitch.input