Ubuntu 最新设置阿里云更新源

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