/usr/lib/x86_64-linux-gnu/libgcr-ui-3.so is in libgcr-3-dev 3.18.0-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgcr-ui-3.so.1.0.0
/usr/lib/x86_64-linux-gnu/libgcr-ui-3.so.1.0.0