nodesource package of node.js includes npm, conflicting with separate npm package

Change-Id: I52d38d39c253e23d2af5a04a58faaaea306ad7b2
diff --git a/packer/provision/basebuild.sh b/packer/provision/basebuild.sh
index 0ebb5e4..f8e8f78 100644
--- a/packer/provision/basebuild.sh
+++ b/packer/provision/basebuild.sh
@@ -83,7 +83,7 @@
     echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
 
     # set up NodeJS repo
-    sudo add-apt-repository -y -r ppa:chris-lea/node.js
+    # Instructions: https://github.com/nodesource/distributions/blob/master/README.md#manual-installation
 
     cat << EOF | base64 -d > /tmp/nodejs-apt-key.gpg
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@@ -121,7 +121,6 @@
         libxml2-utils \
         maven \
         nodejs \
-        npm \
         python \
         python-certifi \
         python-cryptography \