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--override-config

    Specify to use different apt set up inside the chroot than it was
used for creating the base.tgz. Specify this when you want to do
pbuilder --update
     with a different distribution target set up.

    --distribution, --mirror, --othermirror
     options are only valid when --override-config option is specified
in --update target, or when pbuilder --create is being called.
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