I personally think the key issues still holding Linux back are

• Not installed on PCs on standard brick-and-mortar shops
• Microsoft’s tight grip on enterprises and businesses
• Non availability of industry standard applications
• Availability of choice, which creates choice paralysis for the user

I don’t agree that there are no problems on Windows. There are different types of problems but users are so accustomed to them, they will go through more hoops to solve them, when it’s trivial on Linux. We have to introduce Linux much early to users to create familiarity.