可将 http://cn.archive.ubuntu.com/ubuntu/ 替换为下列任意服务器：

Ubuntu 官方（欧洲，国内较慢，无同步延迟）
http://archive.ubuntu.com/ubuntu/
Ubuntu 官方中国（目前是阿里云）
http://cn.archive.ubuntu.com/ubuntu/
网易（广东广州电信/联通千兆双线接入）
http://mirrors.163.com/ubuntu/
搜狐（山东联通千兆接入）
http://mirrors.sohu.com/ubuntu/
阿里云（北京万网/浙江杭州阿里云服务器双线接入）
http://mirrors.aliyun.com/ubuntu/
中国开源软件中心
http://mirrors.oss.org.cn/ubuntu/
首都在线科技
http://mirrors.yun-idc.com/ubuntu/
贝特康姆（江苏常州电信）
http://centos.bitcomm.cn/ubuntu
Linux运维派
https://mirrors.skyshe.cn/ubuntu/
#deb cdrom:[Ubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 ()]/ bionic main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to

# newer versions of the distribution.

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted

# deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted

## Major bug fix updates produced after the final release of the

## distribution.

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted

# deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu

## team. Also, please note that software in universe WILL NOT receive any

## review or updates from the Ubuntu security team.

deb http://mirrors.aliyun.com/ubuntu/ bionic universe

# deb-src http://mirrors.aliyun.com/ubuntu/ bionic universe

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates universe

# deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu

## team, and may not be under a free licence. Please satisfy yourself as to

## your rights to use the software. Also, please note that software in

## multiverse WILL NOT receive any review or updates from the Ubuntu

## security team.

deb http://mirrors.aliyun.com/ubuntu/ bionic multiverse

# deb-src http://mirrors.aliyun.com/ubuntu/ bionic multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates multiverse

# deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates multiverse

## N.B. software from this repository may not have been tested as

## extensively as that contained in the main release, although it includes

## newer versions of some applications which may provide useful features.

## Also, please note that software in backports WILL NOT receive any review

## or updates from the Ubuntu security team.

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

## Uncomment the following two lines to add software from Canonical's

## 'partner' repository.

## This software is not part of Ubuntu, but is offered by Canonical and the

## respective vendors as a service to Ubuntu users.

# deb http://archive.canonical.com/ubuntu bionic partner

# deb-src http://archive.canonical.com/ubuntu bionic partner

deb http://security.ubuntu.com/ubuntu bionic-security main restricted

# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted

deb http://security.ubuntu.com/ubuntu bionic-security universe

# deb-src http://security.ubuntu.com/ubuntu bionic-security universe

deb http://security.ubuntu.com/ubuntu bionic-security multiverse

# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse

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