我已经使用 Ubuntu 有一段时间了，我遇到了很多问题，我不需要发布帖子来获得答案，直到我最近升级到 Ubuntu Vivid。
Ubuntu 很棒，但每次我运行sudo apt-get update更新时都会顺利运行，并返回重复的通知/var/lib/apt/lists。
这甚至不是问题所在。令人沮丧的是，即使我运行建议的更新，它仍然会产生相同的结果。
我之前使用的是 Ubuntu 14.04，然后升级到了 Ubuntu Utopic，之后再升级到 Vivid。
我需要的只是有人能提供一份简洁且没有重复的源列表。
请。
谢谢大家。
编辑：这是我重新加载软件属性 gtk 时遇到的新错误。
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ vivid-security/restricted i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_vivid-security_restricted_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ vivid-security/universe i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_vivid-security_universe_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ vivid-security/multiverse i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_vivid-security_multiverse_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ vivid-security/main i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_vivid-security_main_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
答案1
这是我的处女sources.list
sources.list当文件夹中的文件中包含条目时，也会出现重复/etc/apt/sources.list.d。
# deb cdrom:[Ubuntu-GNOME 15.04 _Vivid Vervet_ - Alpha amd64 (20150316)]/ vivid main multiverse restricted universe
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu vivid main restricted
deb-src http://archive.ubuntu.com/ubuntu vivid main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu vivid-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu vivid-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://archive.ubuntu.com/ubuntu vivid universe
deb-src http://archive.ubuntu.com/ubuntu vivid universe
deb http://archive.ubuntu.com/ubuntu vivid-updates universe
deb-src http://archive.ubuntu.com/ubuntu vivid-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://archive.ubuntu.com/ubuntu vivid multiverse
deb-src http://archive.ubuntu.com/ubuntu vivid multiverse
deb http://archive.ubuntu.com/ubuntu vivid-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu vivid-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://archive.ubuntu.com/ubuntu vivid-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu vivid-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu vivid-security main restricted
deb-src http://archive.ubuntu.com/ubuntu vivid-security main restricted
deb http://archive.ubuntu.com/ubuntu vivid-security universe
deb-src http://archive.ubuntu.com/ubuntu vivid-security universe
deb http://archive.ubuntu.com/ubuntu vivid-security multiverse
deb-src http://archive.ubuntu.com/ubuntu vivid-security 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 vivid partner
# deb-src http://archive.canonical.com/ubuntu vivid partner
您可以使用以下方法删除重复项Y PPA 经理：
sudo add-apt-repository ppa:webupd8team/y-ppa-manager
sudo apt-get update
sudo apt-get install y-ppa-manager
跑步Y PPA 经理
选择先进的
选择扫描并删除重复的 PPA
完成后，开始更新：
sudo apt-get update
答案2
这个应该可以（确保us用你的国家前缀替换）：
deb http://us.archive.ubuntu.com/ubuntu/ vivid main universe restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ vivid main universe restricted multiverse
deb http://us.archive.ubuntu.com/ubuntu/ vivid-security main universe restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ vivid-security main universe restricted multiverse
deb http://us.archive.ubuntu.com/ubuntu/ vivid-updates main universe restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ vivid-updates main universe restricted multiverse