NOTE if you install apt-utils, you will get other warnings (because now the installer can run interactive config and will attempt that and fail). To suppress those and have packages that have interactive config with their defaults, run apt-get like this DEBIAN_FRONTEND=noninteractive apt-get install -y pkgs.
apt.conf(5): config file for APT - Linux man page apt.conf is the main configuration file for the APT suite of tools, all tools make use of the configuration file and a common command-line parser to provide a uniform environment. When an APT tool starts up it will read the configuration specified by the APT_CONFIG environment variable (if any) and then read the files in Dir::Etc::Parts then read the main configuration file specified by Dir Linux apt-get command help and examples - Computer Hope May 04, 2019 Configure proxy for APT? - Ask Ubuntu This is a more general answer along with apt config. As there a lot of places to configure proxy settings, it might get confusing at beginning. Let me summarize some things and suggest some good practices. For console programs. Ex: wget, git and almost every console application which connects to internet.
Sep 16, 2008
apt-get - APT package handling utility - command-line interface Synopsis apt-get [options] [-o config=string] [-c=cfgfile] command [pkg] Description apt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library. Several "front-end" interfaces exist, such as synaptic and Using apt-get Commands In Linux [Complete Beginners Guide Jul 29, 2019
Ubuntu Manpage: apt.conf - Configuration file for APT
Install pkg-config on Ubuntu: sudo apt-get install pkg-config sudo apt-get remove pkg-config. Following command is used to remove the pkg-config package along with its dependencies: sudo apt-get remove --auto-remove pkg-config. This will remove pkg-config and all its dependent packages which is no longer needed in the system. Completely removing pkg-config with all configuration files: