apt-get 更新无法连接到服务器

Question

我尝试在我的 Ubuntu 15.04 上获取更新，但如果无法连接到服务器

me@me:~$ sudo apt-get update 
Err http://archive.ubuntu.com vivid InRelease
Err http://archive.ubuntu.com vivid-updates InRelease
Err http://archive.ubuntu.com vivid-backports InRelease
Err http://archive.ubuntu.com vivid-security InRelease
Err http://archive.ubuntu.com vivid Release.gpg
  Unable to connect to 54.86.15.42:8080:
Err http://archive.ubuntu.com vivid-updates Release.gpg
  Unable to connect to 54.86.15.42:8080:
Err http://archive.ubuntu.com vivid-backports Release.gpg
  Unable to connect to 54.86.15.42:8080:
Err http://archive.ubuntu.com vivid-security Release.gpg
  Unable to connect to 54.86.15.42:8080:
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/vivid/InRelease  
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/vivid-updates/InRelease  
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/vivid-backports/InRelease  
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/vivid-security/InRelease  
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/vivid/Release.gpg  Unable to connect to 54.86.15.42:8080:
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/vivid-updates/Release.gpg  Unable to connect to 54.86.15.42:8080:
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/vivid-backports/Release.gpg  Unable to connect to 54.86.15.42:8080:
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/vivid-security/Release.gpg  Unable to connect to 54.86.15.42:8080:
W: Some index files failed to download. They have been ignored, or old ones used instead

我试图找到解决方案，但无法修复它。这是我到目前为止尝试过的：

1. 修改/etc/resolv.conf为：

   nameserver 8.8.8.8
   nameserver 8.8.8.4
   

2. 我试图 ping Ubuntu 服务器

   me@me:~$ ping archive.ubuntu.com
   PING archive.ubuntu.com (91.189.91.15) 56(84) bytes of data.
   64 bytes from likho.canonical.com (91.189.91.15): icmp_seq=1 ttl=41 time=259 ms
   64 bytes from likho.canonical.com (91.189.91.15): icmp_seq=2 ttl=41 time=257 ms
   64 bytes from likho.canonical.com (91.189.91.15): icmp_seq=3 ttl=41 time=255 ms
   64 bytes from likho.canonical.com (91.189.91.15): icmp_seq=4 ttl=41 time=288 ms
   ^C
   --- archive.ubuntu.com ping statistics ---
   4 packets transmitted, 4 received, 0% packet loss, time 3003ms
   rtt min/avg/max/mdev = 255.160/265.270/288.347/13.437 ms
   

3. 在软件和更新中，将服务器更改为主服务器

4. 在/etc/apt/apt.conf我发现这一行：

   Acquire::http::proxy 54.86.15.42:8080
   

   我试图#在它前面添加但没有用。然后尝试连接到 54.86.15.42:8080 并没有任何反应。并ping到这个地址：

   me@me:~$ sudo ping 54.86.15.42
   PING 54.86.15.42 (54.86.15.42) 56(84) bytes of data.
   ^C
   --- 54.86.15.42 ping statistics ---
   16 packets transmitted, 0 received, 100% packet loss, time 14999ms
   

它似乎与代理或防火墙有关，但我不使用它们中的任何一个。有谁知道如何解决这个问题？

Answer 1

我的问题解决了。我不知道是什么让它再次发挥作用。我尝试了这些命令unset http_proxy并unset https_proxy按照 @nilesh_101 的建议。我做的另一件事是更改代理，然后再次将其更改为默认代理。谢谢大家回答我的问题！

Answer 2

我遇到了同样的问题。然后我清除了 apt.conf 文件的所有内容，它工作正常。