/usr/powerpc-linux-gnu/lib/libubsan.so.0 is in libubsan0-powerpc-cross 6.3.0-18cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/powerpc-linux-gnu/lib/libubsan.so.0.0.0
/usr/powerpc-linux-gnu/lib/libubsan.so.0.0.0