/usr/lib/x86_64-linux-gnu/libcairomm-1.0.so is in libcairomm-1.0-dev 1.10.0-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcairomm-1.0.so.1.4.0
/usr/lib/x86_64-linux-gnu/libcairomm-1.0.so.1.4.0