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I'm new in Linux and I don't know what I need to do in this screen or if it's an error.

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Good question!

Every time you boot your computer, Ubuntu performs a quick, automated scan of the filesystem on your hard drive (/dev/sda) to make sure everything's OK. The clean part of the message means everything is, in fact, OK, and no problems were found. Unless it's causing undue delays in booting, it's not an issue, and it's nothing to worry about!