diff --git a/ci/build_machine_bootstrap.sh b/ci/build_machine_bootstrap.sh
index 63b67b0..f31f6a0 100755
--- a/ci/build_machine_bootstrap.sh
+++ b/ci/build_machine_bootstrap.sh
@@ -35,6 +35,7 @@ fi
 
 # Install Virtualbox 5.2
 echo "deb http://download.virtualbox.org/virtualbox/debian xenial contrib" >> /etc/apt/sources.list
+sed -i "2ideb mirror://mirrors.ubuntu.com/mirrors.txt xenial main restricted universe multiverse\ndeb mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates main restricted universe multiverse\ndeb mirror://mirrors.ubuntu.com/mirrors.txt xenial-backports main restricted universe multiverse\ndeb mirror://mirrors.ubuntu.com/mirrors.txt xenial-security main restricted universe multiverse" /etc/apt/sources.list
 wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
 apt-get update
 apt-get install -y linux-headers-"$(uname -r)" virtualbox-5.2 build-essential unzip git ufw apache2