List of best mirrors for IP address 18.218.242.255, 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/q/qt-advanced-docking-system/libqt-advanced-docking-system3.8.3_3.8.3-1+b1_armhf.deb