/usr/lib/mono/2.0/Microsoft.VisualBasic.dll is in libmono-microsoft-visualbasic8.0-cil 3.0~pre20130627.4dcc70f-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/mono/2.0/../gac/Microsoft.VisualBasic/8.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll