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Linux is an open source operating system (OS) that is lightweight and runs on many systems. It also runs on the Arduino Yún. There are different "flavors" or "distros" (distributions and changes made by different groups) of Linux such as Ubuntu, Debian, and Fedora.

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'"/dev/ttyACM0": Permission denied' on Ubuntu 18.04

As stupid as it may sound but "have you tried turning it off and on again?". Changes to groups only become effective when you have logged out of your account
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