Comment 37 for bug 292606

Mario:
Adding the debconf trigger in every modalias package would imply calling the trigger every time the modaliases are installed which could be, say, 3 times (as currently there are 3 different drivers) in row when dist-upgrading to Karmic. This means that users will see the same message three times during the same dist-upgrade.

The message is not meant to allow users to take further steps during the upgrade. It's simply a warning which explains what they will have to do manually. This should be ok since we're speaking of the case in which users dist-upgrade from the command line instead of relying upon Update Manager (which gets rid of obsolete drivers automatically through nvidia-common).