ubuntu16.04.4更新sudo apt-get update 时显示Unable to connect to 127.0.0.1:33349:

Err:1 http://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial InRelease
  Could not connect to 127.0.0.1:33349 (127.0.0.1). - connect (111: Connection refused)
Err:2 http://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports InRelease
  Unable to connect to 127.0.0.1:33349:
Err:3 http://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-proposed InRelease
  Unable to connect to 127.0.0.1:33349:
Err:4 http://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security InRelease
  Unable to connect to 127.0.0.1:33349:
Err:5 http://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates InRelease
  Unable to connect to 127.0.0.1:33349:
Err:6 http://mirrors.aliyun.com/ubuntu xenial InRelease
  Could not connect to 127.0.0.1:33349 (127.0.0.1). - connect (111: Connection refused)
Reading package lists... Done
W: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial/InRelease  Could not connect to 127.0.0.1:33349 (127.0.0.1). - connect (111: Connection refused)
W: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-backports/InRelease  Unable to connect to 127.0.0.1:33349:
W: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-proposed/InRelease  Unable to connect to 127.0.0.1:33349:
W: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-security/InRelease  Unable to connect to 127.0.0.1:33349:
W: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-updates/InRelease  Unable to connect to 127.0.0.1:33349:
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/xenial/InRelease  Could not connect to 127.0.0.1:33349 (127.0.0.1). - connect (111: Connection refused)
W: Some index files failed to download. They have been ignored, or old ones used instead.

解决方式：打开System setting--Network--Network Proxy ---Method 改为 Automatic --保存--重新 $sudo apt-get clean   $ sudo apt-get update

参考链接点击打开链接

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