/usr/lib/libGTLImageIO.so.0.8 is in libgtlimageio0.8 0.9.16-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libGTLImageIO.so.0.9.16
/usr/lib/libGTLImageIO.so.0.9.16