Verify ubuntu/debian install for host only networking

lib/vagrant/systems/linux.rb

@@ -70,12 +70,13 @@ module Vagrant
       end
 
       def prepare_host_only_network
-        # TODO: Verify ubuntu here, otherwise error and tell user to
-        # implement this manually or to use ubuntu.
-
         # Remove any previous host only network additions to the
         # interface file.
         vm.ssh.execute do |ssh|
+          # Verify debian/ubuntu
+          ssh.exec!("cat /etc/debian_version", :error_key => :network_not_debian)
+
+          # Clear out any previous entries
           ssh.exec!("sudo sed -e '/^#VAGRANT-BEGIN/,/^#VAGRANT-END/ d' /etc/network/interfaces > /tmp/vagrant-network-interfaces")
           ssh.exec!("sudo su -c 'cat /tmp/vagrant-network-interfaces > /etc/network/interfaces'")
         end

templates/strings.yml

@@ -257,3 +257,17 @@
 
   If the box was built for 0.2.x and contains a custom public key, perhaps
   the path to the private key is incorrect. Check your `config.ssh.private_key_path`.
+
+#---------------------------------------------------------------------
+# CATEGORY: Error Messages for Linux System
+#---------------------------------------------------------------------
+:network_not_debian: |-
+  Host only networking is only supported for Debian/Ubuntu by the built-in
+  "Linux" system. If you're using some other distro and want to implement
+  host only networking, please subclass the `Vagrant::Systems::Linux` class
+  and implement the `prepare_host_only_network` and `enable_host_only_network`
+  methods.
+
+  Otherwise, please report your distro and how to modify network interfaces
+  to the Vagrant mailing list or IRC and we'll probably be glad to add it
+  to the internal systems.