/usr/share/gocode/src/golang.org/x/text/internal/export/ is in golang-golang-x-text-dev 0.0~git20170627.0.6353ef0-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/common_test.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/example_test.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/gen.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/gen_common.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/gen_test.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/gen_trieval.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/idna.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/idna_test.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/punycode.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/punycode_test.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/tables.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/trie.go
/usr/share/gocode/src/golang.org/x/text/internal/export/idna/trieval.go