我是 Ubuntu 和 SE 的新手。我最近在测试服务器上安装了 Xenial 16.04，在安装任何软件包之前，我尝试运行 apt-get update。不幸的是，它似乎失败了，并出现以下错误。
Ign:63 http://us.archive.ubuntu.com/ubuntu xenial-backports/main Translation-en
Ign:64 http://us.archive.ubuntu.com/ubuntu xenial-backports/restricted amd64 Packages
Ign:65 http://us.archive.ubuntu.com/ubuntu xenial-backports/restricted i386 Packages
Reading package lists... Done
W: The repository 'http://us.archive.ubuntu.com/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://us.archive.ubuntu.com/ubuntu xenial-updates Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://us.archive.ubuntu.com/ubuntu xenial-backports Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial/main/source/Sources Connection failed [IP: 91.189.91.26 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/source/Sources Connection failed [IP: 91.189.91.26 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/source/Sources Connection failed [IP: 91.189.91.26 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
我尝试禁用 IPv6，运行apt-get autoclean，apt-get-clean然后再次更新。清理后，更新过程中仍然显示所有其他链接都显示“忽略”，这正常吗？
我的 sources.list 文件
# deb cdrom:[Ubuntu-Server 16.04.3 LTS _Xenial Xerus_ - Release amd64 (20170801)]/ xenial main restricted
#deb cdrom:[Ubuntu-Server 16.04.3 LTS _Xenial Xerus_ - Release amd64 (20170801)]/ xenial main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://my.archive.ubuntu.com/ubuntu/ xenial main restricted
#deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://my.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
#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 that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://my.archive.ubuntu.com/ubuntu/ xenial universe
#deb-src http://us.archive.ubuntu.com/ubuntu/ xenial universe
deb http://my.archive.ubuntu.com/ubuntu/ xenial-updates universe
#deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-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://my.archive.ubuntu.com/ubuntu/ xenial multiverse
#deb-src http://us.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://my.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
#deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-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://my.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
#deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-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 xenial partner
#deb-src http://archive.canonical.com/ubuntu xenial partner
#deb http://security.ubuntu.com/ubuntu xenial-security main restricted
# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
#deb http://security.ubuntu.com/ubuntu xenial-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe
#deb http://security.ubuntu.com/ubuntu xenial-security multiverse
# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
deb http://ubuntu.ipserverone.com/ubuntu/ xenial main
#deb-src http://ubuntu.ipserverone.com/ubuntu/ xenial main
答案1
该错误可能是由于网络层实施的防火墙阻止了所有 APT-GET 更新工作而导致的。我已将我的机器移至备用网络，错误似乎已解决。