What are the main challenges in Linux adoption for New users, and how can it be addressed?

Linux should be teach at school instead of windows. Most people assume Linux is harder only because they are not used to it. Once you get accustomed you realize that it's even easier, for example in popular distros with package manager opening a terminal and write a 3 words command followed by the name of software, as hard as it may sound, it's much easier and fast than using google to download shady .exe files that needs to be installed manually.

Also people really needs to stop being lazy. You don't jump into a car and drive it if you don't know how to do it. If you are not down to spend 2 hours of your life learning how to use a machine you use daily you really should change mindset.