/usr/share/go-1.6/src/runtime/cgo/ is in golang-1.6-src 1.6.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/go-1.6/src/runtime/cgo/asm_386.s
/usr/share/go-1.6/src/runtime/cgo/asm_amd64.s
/usr/share/go-1.6/src/runtime/cgo/asm_arm.s
/usr/share/go-1.6/src/runtime/cgo/asm_arm64.s
/usr/share/go-1.6/src/runtime/cgo/asm_nacl_amd64p32.s
/usr/share/go-1.6/src/runtime/cgo/asm_ppc64x.s
/usr/share/go-1.6/src/runtime/cgo/asm_s390x.s
/usr/share/go-1.6/src/runtime/cgo/callbacks.go
/usr/share/go-1.6/src/runtime/cgo/cgo.go
/usr/share/go-1.6/src/runtime/cgo/dragonfly.go
/usr/share/go-1.6/src/runtime/cgo/freebsd.go
/usr/share/go-1.6/src/runtime/cgo/gcc_386.S
/usr/share/go-1.6/src/runtime/cgo/gcc_amd64.S
/usr/share/go-1.6/src/runtime/cgo/gcc_android.c
/usr/share/go-1.6/src/runtime/cgo/gcc_android_386.c
/usr/share/go-1.6/src/runtime/cgo/gcc_android_amd64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_android_arm.c
/usr/share/go-1.6/src/runtime/cgo/gcc_android_arm64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_arm.S
/usr/share/go-1.6/src/runtime/cgo/gcc_arm64.S
/usr/share/go-1.6/src/runtime/cgo/gcc_darwin_386.c
/usr/share/go-1.6/src/runtime/cgo/gcc_darwin_amd64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_darwin_arm.c
/usr/share/go-1.6/src/runtime/cgo/gcc_darwin_arm64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_dragonfly_amd64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_fatalf.c
/usr/share/go-1.6/src/runtime/cgo/gcc_freebsd_386.c
/usr/share/go-1.6/src/runtime/cgo/gcc_freebsd_amd64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_freebsd_arm.c
/usr/share/go-1.6/src/runtime/cgo/gcc_libinit.c
/usr/share/go-1.6/src/runtime/cgo/gcc_libinit_linux_ppc64x.c
/usr/share/go-1.6/src/runtime/cgo/gcc_libinit_openbsd.c
/usr/share/go-1.6/src/runtime/cgo/gcc_libinit_windows.c
/usr/share/go-1.6/src/runtime/cgo/gcc_linux_386.c
/usr/share/go-1.6/src/runtime/cgo/gcc_linux_amd64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_linux_arm.c
/usr/share/go-1.6/src/runtime/cgo/gcc_linux_arm64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_linux_ppc64x.c
/usr/share/go-1.6/src/runtime/cgo/gcc_linux_s390x.c
/usr/share/go-1.6/src/runtime/cgo/gcc_mmap.c
/usr/share/go-1.6/src/runtime/cgo/gcc_netbsd_386.c
/usr/share/go-1.6/src/runtime/cgo/gcc_netbsd_amd64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_netbsd_arm.c
/usr/share/go-1.6/src/runtime/cgo/gcc_openbsd_386.c
/usr/share/go-1.6/src/runtime/cgo/gcc_openbsd_amd64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_ppc64x.S
/usr/share/go-1.6/src/runtime/cgo/gcc_s390x.S
/usr/share/go-1.6/src/runtime/cgo/gcc_setenv.c
/usr/share/go-1.6/src/runtime/cgo/gcc_signal_darwin_armx.c
/usr/share/go-1.6/src/runtime/cgo/gcc_signal_darwin_lldb.c
/usr/share/go-1.6/src/runtime/cgo/gcc_solaris_amd64.c
/usr/share/go-1.6/src/runtime/cgo/gcc_util.c
/usr/share/go-1.6/src/runtime/cgo/gcc_windows_386.c
/usr/share/go-1.6/src/runtime/cgo/gcc_windows_amd64.c
/usr/share/go-1.6/src/runtime/cgo/iscgo.go
/usr/share/go-1.6/src/runtime/cgo/libcgo.h
/usr/share/go-1.6/src/runtime/cgo/mmap.go
/usr/share/go-1.6/src/runtime/cgo/netbsd.go
/usr/share/go-1.6/src/runtime/cgo/openbsd.go
/usr/share/go-1.6/src/runtime/cgo/setenv.go
/usr/share/go-1.6/src/runtime/cgo/signal_darwin_arm.s
/usr/share/go-1.6/src/runtime/cgo/signal_darwin_arm64.s
/usr/share/go-1.6/src/runtime/cgo/signal_darwin_armx.go