Update manager breaks update of packages with certain debconf requirements

[hexafraction]

In a package which uses Debconf within its postinst, for a license agreement, the debconf will assume default values during installation, causing upgrade failures for packages such as in oracle-java6-installer in the ppa:estewei/java PPA (https://launchpad.net/~estewei/+archive/java). The problem appears to be localized to the debconf portion, which the update manager doesn't like in this case.

Proposed solutions:

1. If a package fails to install due to a failure of a preinst or postinst with debconf prompts, re-run the installation of that package with debconf prompts shown.

2. Forde debconf prompting in attended upgrades', deferring unattended updates of packages that fail a preinst or postinst due to debconf until the next attended upgrade

Optimally, there should be an option to select between these options.

Note: I am filing this bug on behalf of an Ask Ubuntu user.