/usr/lib/x86_64-linux-gnu/libchamplain-gtk-0.12.so is in libchamplain-gtk-0.12-dev 0.12.7-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libchamplain-gtk-0.12.so.0.4.2