/usr/aarch64-linux-gnu/bin/strip is in binutils-aarch64-linux-gnu 2.26.1-1ubuntu1~16.04.8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/aarch64-linux-gnu/bin/../../bin/aarch64-linux-gnu-strip
/usr/aarch64-linux-gnu/bin/../../bin/aarch64-linux-gnu-strip