/usr/lib/gcc-cross/powerpc-linux-gnu/5.5.0 is in gcc-5-powerpc-linux-gnu-base 5.5.0-12ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/powerpc-linux-gnu/5
/usr/lib/gcc-cross/powerpc-linux-gnu/5