使用阿里雲的開源鏡像 https://opsx.alibaba.com/mirror 找到ubuntu
在ubuntu下執行命令 sudo mv /etc/apt/sources.list /etc/apt/sources.list_backup 將 sources.list 文件備份
執行 sudo vim /etc/apt/sources.list 編輯 sources.list 文件，將文件內容清空，並粘貼剛纔複製的內容，保存退出
ubuntu 18.04(bionic) 配置如下:
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
執行 sudo apt-get update 更新apt軟件源
注意這個可以不執行
執行 sudo apt-get dist-upgrade 升級全部軟件
完畢。