For Linux beginners, I recommend to check out Linux Tutorial Series Part 01 to learn how to install Ubuntu. In this video, I'm gliding over how to secure Ubuntu. There is a part in this video when I mentioned about using passwd -l to lock accounts inside /etc/shadow file, make sure you don't lock the user accounts you want to use, OK? Or else, you may not be able to log into Ubuntu using those users! Enjoy!
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