Ubuntu 配置鏡像源

注, 如果添加鏡像后沒有自己要安裝的軟件, 切回原鏡像即可, 只是有點慢.

cp /etc/apt/sources.list /etc/apt/sources.list.bak
echo ''>/etc/apt/sources.list
echo deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse>>/etc/apt/sources.list
echo deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse>>/etc/apt/sources.list
echo deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse>>/etc/apt/sources.list
echo deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse>>/etc/apt/sources.list
apt-get update
# cp /etc/apt/sources.list.bak /etc/apt/sources.list # 恢復

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