Adding a new, third-party software repository to your sources.list file.Using Ubuntu PPAs (Personal Package Archives).In this case, there are multiple methods to install newer software on a Linux-based, server oriented distribution. However, sometimes it's possible that a new version of a utility brings important improvements that may be desired (e.g., better performance when running PHP code). In most cases though, even if the software is a few months or even years old, most administrators won't necessarily need the latest features available in new releases.

If every package would always receive all of the latest feature updates, the risk of instability increases, as new, unknown bugs may be introduced, features you rely on may be removed and changes to how programs work may result in making interconnected software incompatible. That's why even if the Apache HTTP server advanced to version 2.4.35, which you can download from the upstream developer's page, in Debian, only version 2.4.25 may be available for the whole duration of the current stable release.

There are a few programs that will receive feature upgrades, for example web browsers, but most packages will only receive security fixes. That's why when a major version is launched (e.g, Debian 9, codenamed Stretch), most of the software versions included in the official repositories will remain unchanged for the duration of that release. Linux distributions that are targeted for use in server applications need to be stable and predictable. Tech Share is Alibaba Cloud's incentive program to encourage the sharing of technical knowledge and best practices within the cloud community. By Alexandru Andrei, Alibaba Cloud Tech Share Author.

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