Ubuntu is described as 'Community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need - a web browser, presentation, document and spreadsheet software, instant messaging and much more' and is a leading Linux Distro in the os & utilities category. There are more than 100 alternatives to Ubuntu for a variety of platforms, including Linux, Self-Hosted, Windows, BSD and Mac apps. The best Ubuntu alternative is Linux Mint, which is both free and Open Source. Other great apps like Ubuntu are Debian, Manjaro Linux, Fedora and Kubuntu.
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There are 2 types of Linux distros: Long-term releases (updates when updates are stable) and rolling (updates when updates are ready). Ubuntu updates when the update is stable. Antergos, as soon as an update is ready. Antergos is Arch based, Ubuntu based on Debian - arguably the biggest difference.