Comment 3 for bug 1029730

Disscussed this on IRC and it does seem reasonable. Suggests: will not cause these to be installed, but once they are they become held against autoremove until the kernel they are related to ages out. As they are large however we should make this change in step with the kernel reaper under:

    https://blueprints.launchpad.net/ubuntu/+spec/desktop-q-clean-old-kernels