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When working in environments where internet access is regulated through a proxy server, it can be a challenge to configure all aspects of a Linux system to adhere to the strict access controls. Among the various configurations required, setting up package managers such as APT (used in Debian and Ubuntu), DNF (used in Fedora and CentOS), YUM (legacy manager for older Red Hat/CentOS systems), and Zypper (used in openSUSE) is crucial to ensure software and updates can be smoothly installed without direct internet access. Here’s how you can configure proxy settings for these various package managers. APT is widely used in Debian-based distributions.