The version you requested (0.12.6-4ubuntu0.3) is not available, but a newer one is (0.12.6-4ubuntu0.4). We redirected you there.
This file is indexed.

/usr/lib/x86_64-linux-gnu/libspice-server.so.1 is in libspice-server1 0.12.6-4ubuntu0.4.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/x86_64-linux-gnu/libspice-server.so.1.10.0