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  1. 进入apt目录下
	cd /etc/apt/
  1. 查看是否有修改文件的权限
  2. 使用vim修改source
	vi sources.list

更换阿里源(根据个人喜好)

deb http://mirrors.aliyun/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-backports main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-proposed main restricted universe multiverse
  1. 更新源
	sudo apt-get update 
	sudo apt-get upgrade

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