/usr/lib/libsundials_nvecserial.so.0 is in libsundials-nvecserial0 2.5.0-3+b3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libsundials_nvecserial.so.0.0.2
/usr/lib/libsundials_nvecserial.so.0.0.2