/usr/lib/libvtkGraphicsTCL.so.5.10 is in tcl-vtk 5.10.1+dfsg-2.1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libvtkGraphicsTCL.so.5.10.1
/usr/lib/libvtkGraphicsTCL.so.5.10.1