Ah, I must have misunderstood your reuqest then. Sorry for that.

Generally speaking an update entails *removing* one version of a package and 
*installing* a newer version of the same package. There is nothing that 
functionally sets apart an update from any other package installation or 
removal, which is why they all eventually get piped through the same dbus call.
Technically of course one could sort of differentiate between install/remove 
and update on a very high level, but to a very limited extent which simply put 
is: you don't authenticate for as long as a the whole batch of available 
updates can be cleanly updated. As soon as an update requires any sort of 
interaction you need to authenticate to do anything. So this is pretty much not 
useful unless you can garuntee that updates never require the removal or 
installation of a  new package which we cannot.

Also, with regards to security we do not ever update automatically in
background unless the system was configured to do so and making this
configuration in turn again requires an admin user to authenticate by
password.

So, I fear while it might be technically possible the cost-to-benefit
ratio is not terrible good for such a feature.

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https://bugs.launchpad.net/bugs/1346234

Title:
  Allow running updates without authentication

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