上次安裝完ubuntu後，就要開啟ubuntu之旅了，首先就是要換安裝源，不然呢，幹什麼都慢，安裝啥都慢～
因此我在此修改了預設源為國內的清華源，具體過程如下：
備份/etc/apt/sources.list
cp /etc/apt/sources.list /etc/apt/sources.list.bak##清華源
deb bionic main restricted universe multiverse
deb-src bionic main restricted universe multiverse
deb bionic-updates main restricted universe multiverse
deb-src bionic-updates main restricted universe multiverse
deb bionic-backports main restricted universe multiverse
deb-src bionic-backports main restricted universe multiverse
deb bionic-security main restricted universe multiverse
deb-src bionic-security main restricted universe multiverse
deb bionic-proposed main restricted universe multiverse
deb-src bionic-proposed main restricted universe multiverse
sudo apt-get update
sudo apt-get upgrade
阿里源
#阿里源
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
中科大源
##中科大源
deb bionic main restricted universe multiverse
deb-src bionic main restricted universe multiverse
deb bionic-updates main restricted universe multiverse
deb-src bionic-updates main restricted universe multiverse
deb bionic-backports main restricted universe multiverse
deb-src bionic-backports main restricted universe multiverse
deb bionic-security main restricted universe multiverse
deb-src bionic-security main restricted universe multiverse
deb bionic-proposed main restricted universe multiverse
deb-src bionic-proposed main restricted universe multiverse
163源
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