/usr/aarch64-linux-gnu/lib/libitm.so.1 is in libitm1-arm64-cross 5.4.0-6ubuntu1~16.04.9cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/aarch64-linux-gnu/lib/libitm.so.1.0.0
/usr/aarch64-linux-gnu/lib/libitm.so.1.0.0