How to just temporarily disable apt proxy setting for installing packages

Question

Apt is able to use proxy to install additional packages along with dependencies. I'm working on a Python project and I needed some extra package that provides a library.

---> 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.

How to temporarily disable proxy (without altering the permanent options/settings)? Preferably, from the command line.

Answer 1

The quickest method for temporarily disabling proxy configuration without altering the permanent settings is to use the command line option like below:

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

This gives the user the mobility between open/public/home network and corporate environments with proxy. From manual page:

   -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.