List of best mirrors for IP address 3.138.200.26, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/raspbian/pool/main/m/mono/libmono-system-runtime-serialization-formatters-soap4.0-cil_6.12.0.199+dfsg-3_all.deb