Ubuntu換源（阿里和中科大兩種）

1、先將使用者更改為root，為了方便

su root	#根據提示輸入密碼

su password root  # 若是root沒有密碼，可先設定密碼再切換

cd /etc/apt

cp sources.list source.list.back

vim sources.list	# 進入vim ，若是許可權不夠則前面加上sudo

# 阿里源

deb  bionic main restricted universe multiverse
deb-src  bionic main restricted universe multiverse
deb  bionic-security main restricted universe multiverse
deb-src  bionic-security main restricted universe multiverse
deb  bionic-updates main restricted universe multiverse
deb-src  bionic-updates main restricted universe multiverse
deb  bionic-proposed main restricted universe multiverse
deb-src  bionic-proposed main restricted universe multiverse
deb  bionic-backports main restricted universe multiverse
deb-src  bionic-backports main restricted universe multiverse
#  中科大源
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

apt-get update		# 更新

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 

apt-get update

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