Staying current with software is crucial, and comprehending the disparities among different update processes is vital. This article delves into the intricacies of Linux system updates, upgrades, and dist-upgrades. By unraveling the nuances of these terms, you can navigate the ever-evolving landscape of Linux software maintenance more effectively. Kindly refer to the following similar guides. What are the different types of DNS Records, and how to add a custom domain name to Azure Active Directory,

The term “Linux system Update” encapsulates a variety of actions, each carrying its own significance. Understanding when to utilize an essential update versus opting for a more comprehensive upgrade can significantly impact your system’s functionality and security.

Join us as we demystify the intricacies of “Linux system Update” in a clear and concise manner. It will empower you to make informed decisions about your Linux system’s maintenance strategy.

Refreshing Package Indexes

Update

The update function resynchronizes package index files from sources, fetching indexes of available packages from specified locations in /etc/apt/sources.

Upgrade

Upgrade is used to install the newest versions of all packages currently installed on the system from the sources enumerated in /etc/apt/sources.list.

Retrieving and upgrading installed packages with new versions available while retaining current installations. Not removing current packages or retrieving/unpacking non-installed ones. Keeping existing versions if upgrading would affect another package’s install status. An update must be performed first so that apt-get knows that new versions of packages are available.

#apt-get update

Dist-upgrade

Dist-upgrade in addition to performing the function of upgrade, also intelligently handles changing dependencies with new versions of packages; apt-get has a “smart” conflict resolution system, and it will attempt to upgrade the most important packages at the expense of less important ones if necessary.

So, the dist-upgrade command may remove some packages. The /etc/apt/sources.list file contains a list of locations from which to retrieve desired package files.

See also apt_preferences(5) for a mechanism for overriding the general settings for individual packages. And with the newer apt tool available from 14.04 onward.