先備份，再編輯，養成好習慣。
以下指令碼可直接執行
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak:
sudo sh -c 'echo "#阿里雲的源速度最快
deb trusty main restricted universe multiverse
deb trusty-security main restricted universe multiverse
deb trusty-updates main restricted universe multiverse
deb trusty-proposed main restricted universe multiverse
deb trusty-backports main restricted universe multiverse
deb-src trusty main restricted universe multiverse
deb-src trusty-security main restricted universe multiverse
deb-src trusty-updates main restricted universe multiverse
deb-src trusty-proposed main restricted universe multiverse
deb-src trusty-backports main restricted universe multiverse
" > /etc/apt/sources.list'
sudo apt update
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak:
sudo sh -c 'echo "#阿里雲的源速度最快
deb xenial main restricted universe multiverse
deb xenial-security main restricted universe multiverse
deb xenial-updates main restricted universe multiverse
deb xenial-proposed main restricted universe multiverse
deb xenial-backports main restricted universe multiverse
deb-src xenial main restricted universe multiverse
deb-src xenial-security main restricted universe multiverse
deb-src xenial-updates main restricted universe multiverse
deb-src xenial-proposed main restricted universe multiverse
deb-src xenial-backports main restricted universe multiverse
" > /etc/apt/sources.list'
sudo apt update
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo sh -c 'echo "#阿里雲的源速度最快
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
" > /etc/apt/sources.list'
sudo apt update
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo sh -c 'echo "#阿里雲的源速度最快
deb focal main restricted universe multiverse
deb-src focal main restricted universe multiverse
deb focal-security main restricted universe multiverse
deb-src focal-security main restricted universe multiverse
deb focal-updates main restricted universe multiverse
deb-src focal-updates main restricted universe multiverse
deb focal-proposed main restricted universe multiverse
deb-src focal-proposed main restricted universe multiverse
deb focal-backports main restricted universe multiverse
deb-src focal-backports main restricted universe multiverse
" > /etc/apt/sources.list'
sudo apt update
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