在一个受限制的地方使用ubuntu办公，可以连接外网，但是网络受到了限制，ping不通，所以问题是电脑实际可以访问deb源的，但是由于ping不通，所以一直显示无法获取数据源。
请问各位高手，有没有办法能在ping不通网络，但是其实有网络的情况下更新源码？如何设置下？

我不是太懂你的意思。
你的ubuntu能连接外网，只是你ubuntu所在网络过滤了icmp 回显数据包。
我理解的对吗？

請提供實際的 deb 檔案全名 及 網址 才能說有沒有可能幫你

您好，我自己感觉是因为网络不能ping得原因不能更新源，因为我是可以访问源得网页的，下载也没有问题。但是切换源每次都是显示：“下载软件仓库失败，检查您得网络”
下面是具体的信息：“W:The repository 'http://mirrors.aliyun.com/ubuntu xenial Release' does not have a Release file., W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., W:See apt-secure(8) manpage for repository creation and user configuration details., W:The repository 'http://mirrors.aliyun.com/ubuntu xenial-updates Release' does not have a Release file., W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., W:See apt-secure(8) manpage for repository creation and user configuration details., W:The repository 'http://mirrors.aliyun.com/ubuntu xenial-backports Release' does not have a Release file., W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., W:See apt-secure(8) manpage for repository creation and user configuration details., W:The repository 'http://mirrors.aliyun.com/ubuntu xenial-security Release' does not have a Release file., W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., W:See apt-secure(8) manpage for repository creation and user configuration details., E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages Connection failed [IP: 115.28.122.210 80], E:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages Connection failed [IP: 115.28.122.210 80], E:Some index files failed to download. They have been ignored, or old ones used instead.”


您看上面他显示都是connection failed，但是那个网页我是可以访问得，不过确实ping不通。所以无法更新，输入sudo apt-get update会出现下面得错误

连接失败 [IP: 112.124.140.210 80]
错误:82 http://mirrors.aliyun.com/ubuntu xenial-backports/restricted i386 Packages
连接失败 [IP: 112.124.140.210 80]
忽略:83 http://mirrors.aliyun.com/ubuntu xenial-backports/restricted all Packages
错误:105 http://mirrors.aliyun.com/ubuntu xenial-security/main amd64 Packages
连接失败 [IP: 112.124.140.210 80]
错误:106 http://mirrors.aliyun.com/ubuntu xenial-security/main i386 Packages
连接失败 [IP: 112.124.140.210 80]
忽略:107 http://mirrors.aliyun.com/ubuntu xenial-security/main all Packages
忽略:108 http://mirrors.aliyun.com/ubuntu xenial-security/main Translation-zh_CN
忽略:109 http://mirrors.aliyun.com/ubuntu xenial-security/main Translation-zh
忽略:110 http://mirrors.aliyun.com/ubuntu xenial-security/main Translation-en
忽略:111 http://mirrors.aliyun.com/ubuntu xenial-security/main amd64 DEP-11 Metadata
忽略:112 http://mirrors.aliyun.com/ubuntu xenial-security/main DEP-11 64x64 Icons
错误:113 http://mirrors.aliyun.com/ubuntu xenial-security/restricted amd64 Packages
连接失败 [IP: 112.124.140.210 80]
错误:114 http://mirrors.aliyun.com/ubuntu xenial-security/restricted i386 Packages
连接失败 [IP: 112.124.140.210 80]
忽略:115 http://mirrors.aliyun.com/ubuntu xenial-security/restricted all Packages
正在读取软件包列表... 完成
W: 仓库 “http://mirrors.aliyun.com/ubuntu xenial Release” 没有 Release 文件。
N: 无法认证来自该源的数据，所以使用它会带来潜在风险。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
W: 仓库 “http://mirrors.aliyun.com/ubuntu xenial-updates Release” 没有 Release 文件。
N: 无法认证来自该源的数据，所以使用它会带来潜在风险。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
W: 仓库 “http://mirrors.aliyun.com/ubuntu xenial-backports Release” 没有 Release 文件。
N: 无法认证来自该源的数据，所以使用它会带来潜在风险。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
W: 仓库 “http://mirrors.aliyun.com/ubuntu xenial-security Release” 没有 Release 文件。
N: 无法认证来自该源的数据，所以使用它会带来潜在风险。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages 连接失败 [IP: 112.124.140.210 80]
E: 无法下载 http://mirrors.aliyun.com/ubuntu/dists/ ... 6/Packages 连接失败 [IP: 112.124.140.210 80]
E: 部分索引文件下载失败。如果忽略它们，那将转而使用旧的索引文件。

poloshiao, 请看4楼的帖子，谢谢。主要是遇到这种可以访问源得网页，但是ping不通得情况，如何处理。

你的源列表有问题吧，无法下载的那些文件在源里全部不存在，

不明白为什么会去下载Packages
应该是下载Packages.gz Packages.xz 才对

qy117121, 我直接网络访问时可以的，但是却是显示无法找到。我检查了下是ping不通。

http://mirrors.aliyun.com/ubuntu/dists/ ... 4/Packages
浏览器打开这个也是没有文件啊

真实地址可用 --print-uris 获取，例如 apt-get update --print-uris

你的意思是浏览器能访问”http://mirrors.aliyun.com“，但是”ping mirrors.aliyun.com“失败。
所以你认为”sudo apt-get update“的失败和ping的失败有关系。

烟波钓叟, 是的，您完美解释了我想表达的，我太感谢了。

直观上应该是这样的。因为我按照源的说明，访问源地址，包括源后续的子地址都是可以的，也可以下载deb文件，可是就是不能更新。
我ping不通，ping不能用，这个是管理员给关闭了，我没有权限打开。

vickycq, 谢谢您，我明天试一下，万分感谢！