/usr/lib/x86_64-linux-gnu/libalglib.so.3.10 is in libalglib3.10 3.10.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libalglib.so.3.10.0
/usr/lib/x86_64-linux-gnu/libalglib.so.3.10.0