One more: OEMs like Dell and HP aren't allowed (by Microsoft) to sell PCs that dual-boot between Windows and something else, such as GNU/Linux so the only people that get to try Linux are those that have it pre-installed as the only OS, or those willing and able to install it themselves. Source: read about it somewhere or other; main topic was the history of BeOS.
Why? As far as I am concerned these are all legacy problems. Drivers mostly work, people are aware of Linux and it can be e.g. run off an external drive. The problem is desktop Linux just isn't good enough. From a macro perspective it takes significant effort to manage, significant effort to develop for and provides significantly less value to users, developers and organizations alike. And exceptions doesn't make that less true. There is no conspiracy against Linux, or at least not an effective one. If there is anything hurting Linux it is its mainstream proponents like Google, who like to take but not give back agency. If desktop Linux was good enough, or more precisely great at what people need, they would be using it.
