安装好ubuntu 17.10后，我们发现使用apt-get 安装软件时特别慢，所以需要更换一下软件源。
方法：
1.备份自带源
sudo cp /etc/apt/sources.list ~/sources.list.bak2.修改源：
把以下内容贴到/etc/apt/sources.list文件中：
# deb cdrom:[Ubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412)]/ zesty 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/ artful main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirrors.aliyun.com/ubuntu/ artful-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WIKeGJciLL NOT receive any
## review or updates from the Ubuntu security team.
deb http://mirrors.aliyun.com/ubuntu/ artful universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty universe
deb http://mirrors.aliyun.com/ubuntu/ artful-updates universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty-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/ artful multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty multiverse
deb http://mirrors.aliyun.com/ubuntu/ artful-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty-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/ artful-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty-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 zesty partner
# deb-src http://archive.canonical.com/ubuntu zesty partner# deb cdrom:[Ubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412)]/ zesty 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/ artful main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
#deb http://mirrors.aliyun.com/ubuntu/ artful-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty-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/ artful universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty universe
#deb http://mirrors.aliyun.com/ubuntu/ artful-updates universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty-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/ artful multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty multiverse
#deb http://mirrors.aliyun.com/ubuntu/ artful-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty-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/ artful-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ zesty-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 zesty partner
# deb-src http://archive.canonical.com/ubuntu zesty partner3.更新源
sudo apt-get update以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。
