Apt能够使用代理来安装其他软件包以及依赖项。我正在做一个Python项目，我需要一些额外的包来提供一个库。
---> 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。
在不更改永久设置的情况下暂时禁用代理配置的最快方法是使用如下所示的命令行选项：
sudo apt-get -o Acquire::http::proxy=false install <package>
这使用户能够在开放/公共/家庭网络和具有代理的企业环境之间移动。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.