/usr/lib/slepcdir/3.6.1/x86_64-linux-gnu-complex-debug/lib/libslepc_complex.so is in libslepc-complex-3.6.1-dbg 3.6.1.dfsg1-2build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/slepcdir/3.6.1/x86_64-linux-gnu-complex-debug/lib/libslepc_complex.so.3.6.1