Comment 1 for bug 2052637

The code in lp:ubuntu-archive-tools does this:

    nvSet = set()
    for archive_reference in (
            'ubuntu',
            'ppa:oem-solutions-group/ubuntu/nvidia-driver-staging',
            'ppa:albertomilone/ubuntu/nvidia-testing',
            'ppa:graphics-drivers/ubuntu/ppa',
        ):
        archive = launchpad.archives.getByReference(reference=archive_reference)
        srcs = archive.getPublishedSources(distro_series=series, source_name='nvidia-graphics-drivers-', status='Published')
        for src in srcs:
            nvSet.add(src.source_package_name)
    newSet.update(nvSet)

And there is apparently no nvidia-graphics-drivers-550-server package in any of these archives, because running update-i386-whitelist doesn't pick it up. (It's definitely not in the Ubuntu archive.) So where is this package, that we should add it to the whitelist?