Comment 21 for bug 121096

slamdunk:
That's more of a support request ( https://answers.launchpad.net/ ) than a bug report but the odds are the necessary linux-restricted driver is missing due to a meta package not being installed (so as your kernel is updated a new linux-restricted is not being installed t). Thttps://answers.launchpad.net/oohis is a very rough guess though as there isn't much information to go on (this isn't really the right place for that question).