2.选择合适的源,替换原文件的内容,保存编辑好的文件
deb http://mirrors.aliyun.com/ubuntu/ XXXXX main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ XXXXX-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ XXXXX-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ XXXXX-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ XXXXX-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ XXXXX main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ XXXXX-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ XXXXX-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ XXXXX-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ XXXXX-backports main restricted universe multiverse
使用的是18.04的版本,因此XXXX修改為bionic.具體的不同的ubuntu版本的XXXXX修改為結合ubuntu版本.
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb 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 main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse