This file is indexed.

/usr/lib/mono/4.5/Mono.CSharp.dll is in libmono-csharp4.0c-cil 3.2.8+dfsg-4ubuntu1.

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

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