3.13.0-96.143) is not available, but a newer one is (3.13.0-166.216). We redirected you there.
/usr/lib/sdpa/mex/gensdpafile.m is in sdpam 7.3.9+dfsg-1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/sdpa/mex/../../../share/sdpa/mex/gensdpafile.m