You are adding the packages too late in the process. The installation task may already have run when this task is run (since there are no predecessors or successors defined it is actually undefined when in the `package_installation` phase this task will run). Take a look at [providers/ec2/tasks/packages.py](https://github.com/andsens/bootstrap-vz/blob/f8dd196e594daf8f8de61b87b69cf3f1cf8ff7d9/bootstrapvz/providers/ec2/tasks/packages.py) to see where in the task graph a package adding task should be placed.