Update an Ubuntu or Debian System

Introduction

The apt (aptitude) command is just a a shortened version of the apt-get command. They are synonymous terms. Use the ‘apt’ command to update and manage your installed software packages. Use with Ubuntu or Debian Linux servers.

Update and upgrade your system

# apt update (date your local repository list)
# apt upgrade (update all installed packages)
# apt autoremove (remove packages that were installed as dependencies)
# apt autoclean (clean the /var/cache/apt/archive folder).

List all installed packages

dpkg --list

apt list --installed

Get a list of all packages that can be ugraded

apt list --upgradable

Remove packages with out uninstalling config files

sudo apt remove {package name}

Remove packages including config Files

sudo apt remove --purge {package name}

Repository location

sudo cat /etc/apt/sources.list

sudo ls /etc/apt/sources.list.d

Ref: https://askubuntu.com/questions/668582/false-disk-full-error-apt-get-unable-to-install-or-remove