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首先切換到root使用者(進入root和密碼在標題"安裝ubuntu18"的序號"11"處有寫)

cp /etc/apt/sources.list /etc/apt/sources.list.bak

vim /etc/apt/sources.list

########   ubuntu18.04 阿里雲映象源   ###############

deb  bionic main restricted universe multiverse
deb  bionic-security main restricted universe multiverse
deb  bionic-updates main restricted universe multiverse
deb  bionic-proposed main restricted universe multiverse
deb  bionic-backports main restricted universe multiverse
deb-src  bionic main restricted universe multiverse
deb-src  bionic-security main restricted universe multiverse
deb-src  bionic-updates main restricted universe multiverse
deb-src  bionic-proposed main restricted universe multiverse
deb-src  bionic-backports main restricted universe multiverse
########   阿里雲映象源 end  ###############

apt-get update

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