This file is indexed.

/usr/lib/mono/4.5/Mono.Messaging.dll is in libmono-messaging4.0-cil 4.2.1.102+dfsg2-7ubuntu4.

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

It is a symlink to /usr/lib/mono/4.5/../gac/Mono.Messaging/4.0.0.0__0738eb9f132ed756/Mono.Messaging.dll