如何暂时禁用 apt 代理设置以安装软件包

Question

Apt 能够使用代理来安装附加包以及依赖项。我正在开发一个 Python 项目，我需要一些提供库的额外包。

---> sudo apt-get update
Err:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
  Could not resolve 'proxy.internal'
Err:2 http://archive.ubuntu.com/ubuntu bionic InRelease
  Could not resolve 'proxy.internal'
Err:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
  Could not resolve 'proxy.internal'
Err:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
  Could not resolve 'proxy.internal'
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease  Could not resolve 'proxy.internal'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Could not resolve 'proxy.internal'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  Could not resolve 'proxy.internal'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease  Could not resolve 'proxy.internal'
W: Some index files failed to download. They have been ignored, or old ones used instead.

如何暂时禁用代理（不更改永久选项/设置）？最好从命令行。

Answer 1

暂时禁用代理配置而不更改永久设置的最快方法是使用命令行选项，如下所示：

sudo apt-get -o Acquire::http::proxy=false install <package>

这使用户可以通过代理在开放/公共/家庭网络和企业环境之间移动。从手册页：

   -o, --option
       Set a Configuration Option; This will set an arbitrary configuration option. The syntax is -o
       Foo::Bar=bar.  -o and --option can be used multiple times to set different options.