If you don’t have access to, don’t want to download, or want to build a custom version of the Ubuntu development box, you can do so locally using Packer. The template is stored in the boxes directory of your zendev source.
# Switch to your zendev checkout (may not be under ~/src)
cd ~/src/zendev/boxes/ubuntu-14.04-CC-1.x
# Build the box
packer build ubuntu-14.04-amd64.json
# First, remove the existing box. If you don't want to remove the existing
# box, don't do this. Either way, any existing instances will be
# unaffected.
vagrant box remove ubuntu-14.04-CC-1.x.box
# Now add the box you just generated as the new ubuntu-14.04-CC-1.x base
# box. If you didn't remove the one above, pick a new name. You can
# generate Vagrant boxes using "vagrant init BOXNAME".
vagrant box add ubuntu-14.04-CC-1.x \
~/src/zendev/boxes/ubuntu-14.04-CC-1.x.box
zendev box create --type CC-1.x mynewbox