Linux is not Ubuntu. Linux is a part of Ubuntu.
Linux is not the only 'alternative' OS around. Even for the x86 architecture.
Try these: FreeBSD, DragonFly, Plan9, BeOS, Chrome OS (who is another Linux distro btw).
Moreover, every linux distro should be considered different than the other. for instance Ubuntu is clearly heading towards GUI fonctionnalities. ArchLinux is still a DIY operating system.
Linux is not the only 'alternative' OS around. Even for the x86 architecture.
Try these: FreeBSD, DragonFly, Plan9, BeOS, Chrome OS (who is another Linux distro btw).
Moreover, every linux distro should be considered different than the other. for instance Ubuntu is clearly heading towards GUI fonctionnalities. ArchLinux is still a DIY operating system.