/usr/share/go-1.8/src/crypto/sha256/ is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/go-1.8/src/crypto/sha256/example_test.go
/usr/share/go-1.8/src/crypto/sha256/fallback_test.go
/usr/share/go-1.8/src/crypto/sha256/sha256.go
/usr/share/go-1.8/src/crypto/sha256/sha256_test.go
/usr/share/go-1.8/src/crypto/sha256/sha256block.go
/usr/share/go-1.8/src/crypto/sha256/sha256block_386.s
/usr/share/go-1.8/src/crypto/sha256/sha256block_amd64.s
/usr/share/go-1.8/src/crypto/sha256/sha256block_decl.go
/usr/share/go-1.8/src/crypto/sha256/sha256block_generic.go
/usr/share/go-1.8/src/crypto/sha256/sha256block_ppc64le.s
/usr/share/go-1.8/src/crypto/sha256/sha256block_s390x.go
/usr/share/go-1.8/src/crypto/sha256/sha256block_s390x.s