/usr/lib/x86_64-linux-gnu/libibus-1.0.so.5 is in libibus-1.0-5 1.5.5-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libibus-1.0.so.5.0.505
/usr/lib/x86_64-linux-gnu/libibus-1.0.so.5.0.505