As discussed in the comments, this is a Yeoman problem on Ubuntu 13.10:
- We don't have this issue with Ubuntu 12.04
- There is the same issue with other generators ("yo webapp") on Ubuntu 13.10
As a workaround, I recommend you have a look at our Docker container:
https://github.com/jhipster/jhipster-docker
This will allow you to run the full JHipster stack, with Ubuntu 12.04, inside a container! Just use it to generate the app, then you can work directly on your host machine.