+. install add-apt-repository software

sudo apt-get install python-software-properties

sudo apt-get install software-properties-common


+. repository management

add-apt-repository ppa:~~~~

add-apt-repository --remove -y ppa:~~~


grep -h ^deb /etc/apt/sources.list /etc/apt/sources.list.d/*

grep -h ^deb* /etc/apt/sources.list /etc/apt/sources.list.d/*

grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/*




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