Add Ubuntu resources

Ubuntu Documentation

content/roadmaps/102-devops/content/102-managing-servers/100-operating-system/102-ubuntu.md

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-# Ubuntu
+# Ubuntu
+
+Ubuntu is a free and open-source Linux distribution based on Debian. Ubuntu is available in three versions Desktop, Server and Core.
+
+<BadgeLink badgeText='Official Website' colorScheme='blue' href='https://ubuntu.com/'>Ubuntu Website</BadgeLink>
+<BadgeLink badgeText='Official Documentation' colorScheme='blue' href='https://help.ubuntu.com/'>Ubuntu Documentation</BadgeLink>
+<BadgeLink badgeText='Install Documentation' colorScheme='blue' href='https://ubuntu.com/tutorials/install-ubuntu-desktop#1-overview'>Install Ubuntu Desktop Documentation</BadgeLink>
+<BadgeLink badgeText='Tutorials' colorScheme='yellow' href='https://itsfoss.com/getting-started-with-ubuntu/'>Getting Started with Ubuntu Tutorials</BadgeLink>