/usr/bin/i686-w64-mingw32-gcc-posix is in gcc-mingw-w64-i686 7.3.0-11ubuntu1+20.2build1.
This file is owned by root:root, with mode 0o755.
It is a symlink to /usr/bin/./usr/bin/i686-w64-mingw32-gcc-7.3-posix
/usr/bin/./usr/bin/i686-w64-mingw32-gcc-7.3-posix