[qubes-users] Qubes OS 4.1.0 has been released!

Dear Qubes Community,

At long last, the Qubes 4.1.0 stable release has arrived! The
culmination of years of development, this release brings a host of new
features, major improvements, and numerous bug fixes. Read on to find
out what's new, how to install or upgrade to the new release, and all
the noteworthy changes it includes.

## What's new in Qubes 4.1.0?

In case you still haven't heard, Qubes 4.1.0 includes several major new
features, each of which is explained in depth in its own article.

### Qubes Architecture Next Steps: The GUI Domain

The GUI domain is a qube separate from dom0 that handles all
display-related tasks and some system management. This separation allows
us to more securely isolate dom0 while granting the user more
flexibility with respect to graphical interfaces.

Note: The GUI domain is still experimental, so it's an opt-in feature in
Qubes 4.1.0:

### Qubes Architecture Next Steps: The New Qrexec Policy System

Qrexec is is an RPC (remote procedure call) mechanism that allows one
qube to do something inside another qube. The qrexec *policy* system
enforces "who can do what and where." Qubes 4.1 brings a new qrexec
policy format, significant performance improvements, support for socket
services, and policy notifications that make it easier to detect

### New Gentoo templates and maintenance infrastructure

There are three new flavors of Gentoo templates, as well as an advanced
infrastructure for automated building and testing, which also supports
Linux kernel and Arch Linux building and testing.

### Improvements in testing and building: GitLab CI and reproducible builds

This article explains our work on continuous integration (CI), which
automates and improves several aspects of the development process, and
reproducible builds, which improves the security of the build and
verification process.

### Reproducible builds for Debian: a big step forward

This article explains the tools and infrastructure we've built to verify
official package builds by rebuilding them. While this was supposed to
be possible in theory, making it a reality required significant work,
including rewriting certain components from scratch.

### More improvements, bug fixes, and updated components

In addition to the articles above, there are also numerous other
improvements and bug fixes listed in the release notes (reproduced
below) and in the issue tracker:

- Qubes OS 4.1 release notes | Qubes OS