Is Linux operating system free?

Related questions

1. Can you download Linux for free?
2. What is the difference between Debian and Ubuntu?
3. What is Debian testing?
4. How do you pronounce Debian Linux?
5. Is Debian same as Ubuntu?
6. Is Debian Testing stable enough?
7. Is Debian compatible with Ubuntu?
8. Is Linux the same as Unix?
9. Is Kali a Debian?
10. Is Debian unstable safe?

Tags

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2. #systems
3. #kernel
4. #source
5. #linux
6. #primary
7. #software
8. #between
9. #popular
10. #system
11. #although
12. #contemporary
13. #difference
14. #widely
15. #operating
16. #components