Update vagrant config

support/Vagrantfile

 # -*- mode: ruby -*-
 # vi: set ft=ruby :
 
-# A vagrant config for testing against gcc-4.4.
+# A vagrant config for testing against gcc-4.8.
 Vagrant.configure("2") do |config|
-  config.vm.box = "bento/ubuntu-10.04"
+  config.vm.box = "ubuntu/trusty64"
 
   config.vm.provider "virtualbox" do |vb|
     vb.memory = "4096"
   end
 
   config.vm.provision "shell", inline: <<-SHELL
-    sed -i 's/us.archive/old-releases/' /etc/apt/sources.list
     apt-get update
     apt-get install -y g++ make wget
-    wget -q https://www.dropbox.com/s/ssvomsla6bkx2wl/cmake-3.14.4-Linux-x86_64.tar.gz
+    wget -q https://github.com/Kitware/CMake/releases/download/v3.14.5/cmake-3.14.4-Linux-x86_64.tar.gz
     tar xzf cmake-3.14.4-Linux-x86_64.tar.gz
     ln -s `pwd`/cmake-3.14.4-Linux-x86_64/bin/cmake /usr/local/bin
   SHELL