I have a Dell Precision M6700 with a proprietary Broadcom wireless card. Almost every time that I have installed a new version of the Linux kernel (I am running Ubuntu 12.04) my wireless card either stops working or the network manager thinks forever about connecting but never does. These problems are trivially fixed by booting with an older, stable, version of the Linux kernel but I can't help but wonder if there is a good reason for this behavior. Why can't the developers simply test out their code on machines with Broadcom wireless cards since there are evidently problems with this class of wireless cards with almost every new release? If it is an issue of physically having machines to beta test on I would be happy to volunteer mine since I can always recover pretty easily. One other possibility: could my problems be related to the fact that I'm dual booting Windows and Ubuntu?