Description: The ‘apt-get upgrade’ command is a fundamental tool in package management on Debian-based operating systems, such as Ubuntu. Its primary function is to update only the packages that are already installed on the system, ensuring they are kept up to date with the latest versions available in the configured repositories. Unlike ‘apt-get dist-upgrade’, which may install or remove packages to satisfy dependencies, ‘apt-get upgrade’ focuses on upgrading existing packages without making changes to the system’s structure. This command is essential for maintaining the security and stability of the system, as updates often include security patches and performance improvements. When executing ‘apt-get upgrade’, the system checks the versions of the installed packages and compares them with the versions available in the repositories, downloading and installing only those that have updates available. This approach allows system administrators and users to maintain tighter control over the installed software, minimizing the risk of introducing unwanted changes to the operating system.
