/usr/lib/mono/2.0/mod-mono-server2.exe is in mono-apache-server2 3.0.11-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/mono/2.0/../gac/mod-mono-server2/3.0.0.0__0738eb9f132ed756/mod-mono-server2.exe