Ubuntu official source

Due to the domestic use of official sources caused by slow download speed and other reasons, many people will be the official source to replace the Ali, etc., but some application installation will be error. The official sources are now shared as follows:

To back up the current source:

Execute command: #sudo cp /etc/apt/sources.list /etc/apt/sources.list.back

To Edit a recovery source:

　　执行命令：# sudo gedit /etc/apt/source.list 　　#推荐使用gedit比较方便复制粘贴，最好获取root权限，不然可能会出现保存错误。

Ubuntu官方源：

#deb cdrom:[ubuntu 16.04.3 LTS _xenial xerus_-Release amd64 (20170801)]/xenial main restricted# see Http://help.ubuntu. Com/community/upgradenotes for what to upgrade to# newer versions of the Distribution.deb Http://us.archive.ubuntu.com/ubu Ntu/xenial main restricted# deb-src http://us.archive.ubuntu.com/ubuntu/xenial main restricted## Major bug fix updates P Roduced after the final release of the## Distribution.deb http://us.archive.ubuntu.com/ubuntu/xenial-updates main Restri  cted# deb-src http://us.archive.ubuntu.com/ubuntu/xenial-updates main restricted## n.b. Software from this repository is Entirely unsupported by the ubuntu## team. Also, please note this software in universe won't receive any## review or updates from the Ubuntu security Team.deb htt P://us.archive.ubuntu.com/ubuntu/xenial universe# deb-src http://us.archive.ubuntu.com/ubuntu/xenial universedeb Http://us.archive.ubuntu.com/ubuntu/xenial-updates universe# deb-src Http://us.archive.ubuntu.com/ubuntu/xeniaL-updates universe## n.b. Software from this repository are entirely unsupported by the Ubuntu # # team, and May isn't unde R a free licence. Satisfy yourself as to # # Your rights to use the software. Also, please note this software in # # Multiverse won't receive any review or updates from the ubuntu## security team.de b http://us.archive.ubuntu.com/ubuntu/xenial multiverse# deb-src http://us.archive.ubuntu.com/ubuntu/xenial Multiversedeb http://us.archive.ubuntu.com/ubuntu/xenial-updates multiverse# deb-src http://us.archive.ubuntu.com/ Ubuntu/xenial-updates multiverse## n.b. Software from this repository could not be been tested as## extensively as that C Ontained in the main release, although it includes## newer versions of some applications which may provide useful features . # # Also, please note this software in Backports won't receive any review## or updates from the Ubuntu security team.de b http://us.archive.ubuntu.com/ubuntu/xenial-backports main restricted universemultiverse# deb-src http://us.archive.ubuntu.com/ubuntu/xenial-backports main restricted universe multiverse## Uncomment the following, lines to add software from Canonical ' s## ' partner ' repository.## This software was not part of Ubuntu, but was offered by Canonical and the## respective vendors as a service to Ubuntu users.# Deb Http://archive.canonic Al.com/ubuntu xenial partner# deb-src http://archive.canonical.com/ubuntu xenial partnerdeb/http Security.ubuntu.com/ubuntu xenial-security main restricted# deb-src Http://security.ubuntu.com/ubuntu Xenial-security main restricteddeb http://security.ubuntu.com/ubuntu xenial-security universe# deb-src/http Security.ubuntu.com/ubuntu xenial-security universedeb Http://security.ubuntu.com/ubuntu xenial-security Multiverse # DEB-SRC Http://security.ubuntu.com/ubuntu xenial-security Multiverse

　　

Ubuntu official source