/usr/lib/x86_64-linux-gnu/libtinfo.so is in libtinfo-dev 6.0+20160213-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/x86_64-linux-gnu/libtinfo.so.5
/lib/x86_64-linux-gnu/libtinfo.so.5