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sudo apt-get update * apt(Advance Packging Tools) 설치 되어 있는 패키지들의 새로운 버전이 있는지 확인할 때 사용한다. sudo apt update //or sudo apt-get update The sudo apt-get update command is used to download package information from all configured sources. The sources often defined in the /etc/apt/sources.list file and other files located in /etc/apt/sources.list.d directory. So when you run update command, it downloads ..