/usr/lib/x86_64-linux-gnu/libkernlib.so is in libkernlib1-dev 20061220+dfsg3-4.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libkernlib.so.1_gfortran.2006
/usr/lib/x86_64-linux-gnu/libkernlib.so.1_gfortran.2006