/usr/i686-w64-mingw32/ is in binutils-mingw-w64-i686 2.30-7ubuntu1+8ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/i686-w64-mingw32/bin/
/usr/i686-w64-mingw32/bin/ar
/usr/i686-w64-mingw32/bin/as
/usr/i686-w64-mingw32/bin/dlltool
/usr/i686-w64-mingw32/bin/ld
/usr/i686-w64-mingw32/bin/ld.bfd
/usr/i686-w64-mingw32/bin/nm
/usr/i686-w64-mingw32/bin/objcopy
/usr/i686-w64-mingw32/bin/objdump
/usr/i686-w64-mingw32/bin/ranlib
/usr/i686-w64-mingw32/bin/readelf
/usr/i686-w64-mingw32/bin/strip
/usr/i686-w64-mingw32/lib/
/usr/i686-w64-mingw32/lib/ldscripts/
/usr/i686-w64-mingw32/lib/ldscripts/i386pe.x
/usr/i686-w64-mingw32/lib/ldscripts/i386pe.xa
/usr/i686-w64-mingw32/lib/ldscripts/i386pe.xbn
/usr/i686-w64-mingw32/lib/ldscripts/i386pe.xe
/usr/i686-w64-mingw32/lib/ldscripts/i386pe.xn
/usr/i686-w64-mingw32/lib/ldscripts/i386pe.xr
/usr/i686-w64-mingw32/lib/ldscripts/i386pe.xu