Linux and Ubuntu are different from each other. Linux is an OS kernel which is free and open-source and is based on UNIX, whereas, Ubuntu is a Linux Distro, or Linux Distribution or a Linux Project, that took up Linux and modified and added many features to make it more appealing to the user. Like Ubuntu there are numerous operating systems that are available out there for anyone to download, install and use it.
If you wish to become proficient in Linux, check out the Linux course from Intellipaat, also, watch the following YouTube video on Linux Commands.
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