Can I use Juju local deployment under Ubuntu 12.10?

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http://askubuntu.com – I want to deploy Juju charms locally (type: local) on my Ubuntu 12.10 desktop system in order to test a charm I want to write. The problem is that when I try to juju deploy a charm, juju status soon displays the deployed unit's status as install-error. Further investigation with juju debug log reveals that Juju failed to install grub-pc from the precise repository to the local container. Now I am asking myself if this problem appears because I try to locally deploy to a machine that does not run Ubuntu 12.04. Is this the case? Should I rather install Ubuntu in a real virtual machine such as (HowTos)