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======
ubuntu
======
Use Ubuntu cloud images as the baseline for built disk images.
Overrides:
* To use a non-default URL for downloading base Ubuntu cloud images,
use the environment variable ``DIB_CLOUD_IMAGES``
* To download a non-default release of Ubuntu cloud images, use the
environment variable ``DIB_RELEASE``. This element will export the
``DIB_RELEASE`` variable.
* Use ``DIB_DISTRIBUTION_MIRROR`` to override the ``sources.list``
with an alternative mirror
* Setting ``DIB_DISTRIBUTION_MIRROR_UBUNTU_IGNORE`` to an
extended-regexp (i.e. the argument to the ``=~`` bash comparitor)
which, when matched, will *not* set that line to the
``DIB_DISTRIBUTION_MIRROR``. For example, if your local mirror
does not mirror the universe and multiverse components, set this to
``(universe|multiverse)``
* Setting ``DIB_DISTRIBUTION_MIRROR_UBUNTU_INSECURE`` updates apt
settings to allow insecure/unuthenticated repositories.
.. element_deps::
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