Where is Linux...or an open source OS?

Its certainly not on my computer. Neither on my friends computer nor in my college, neither used in banks I visit, nor in railway stations. This post is not about Mac OS X, which also suffers from identity crisis in India. But talking of linux, there is a name worth mentioning, Ubuntu. Where is it?

This is first of my Poll Post, where I wont write much and would just throw a question up to grab and would wait for answers.

Q: Where is linux? What can be the reasons behind any OS-OS not gaining popularity? And why are you not using it?

So friends please feel free to answer.