I'm looking for the proxy settings on Ubuntu Server 18.04.
I found them in regular Ubuntu under
/etc/apt/apt.conf/proxy, but the apt.conf folder is missing.
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I found the information regarding the proxy configuration in this link
The instructions are:
Create a new configuration file named proxy.conf.
sudo touch /etc/apt/apt.conf.d/proxy.conf
Open the proxy.conf file in a text editor.
sudo vi /etc/apt/apt.conf.d/proxy.conf
Add the following line to set your HTTP proxy.
Add the following line to set your HTTPS proxy.
Save your changes and exit the text editor.