A common main image for all other uBlue images, with minimal (but important) adjustments to Fedora.

1. Features
2. Tips and Tricks
3. How to Install
4. Verification
5. Configuring Automatic Updates
6. Making your own

You should be familiar with immutable desktops. These are Fedora ostree images that have been modified with the following quality of life features:

• Start with a Fedora image
• Adds the following packages to the base image:
  • Hardware acceleration and codecs
  • distrobox for terminal CLI and user package installation
  • A selection of udev rules and service units
  • Various other tools: check out the complete list of packages
• Sets automatic staging of updates for the system
• Sets flatpaks to update twice a day
• Everything else (desktop, artwork, etc) remains stock so you can use this as a good starting image

These images are immutable, you can't, and really shouldn't, install packages like in a mutable "normal" distribution. Applications should be installed using Flatpak whenever possible (execpt for IDEs in some cases, more below). Should that not be possible, you can use distrobox to have images of mutable distributions where you can install applications normally. Want an application that is only available on Arch Linux and one that is only on Ubuntu? Well, now can have both!

Distrobox is very powerful, for example you can use to host your entire development environment completely separate from your host system. Or use it to run a container for your virtual machines.

ublue-os/base-main is also very well suited for servers, and users are expected to make full use of podman to host containers running "typical" server software i.e. nginx, caddy and others.

1. Download the image you want
2. Follow these instructions
3. File an issue if you find a problem

sudo rpm-ostree rebase ostree-unverified-registry:ghcr.io/ublue-os/silverblue-main:37

sudo rpm-ostree rebase ostree-unverified-registry:ghcr.io/ublue-os/kinoite-main:37

sudo rpm-ostree rebase ostree-unverified-registry:ghcr.io/ublue-os/lxqt-main:37

sudo rpm-ostree rebase ostree-unverified-registry:ghcr.io/ublue-os/mate-main:37

sudo rpm-ostree rebase ostree-unverified-registry:ghcr.io/ublue-os/sericea-main:38

sudo rpm-ostree rebase ostree-unverified-registry:ghcr.io/ublue-os/vauxite-main:37

sudo rpm-ostree rebase ostree-unverified-registry:ghcr.io/ublue-os/base-main:37

These images are signed with sisgstore's cosign. You can verify the signature by downloading the cosign.pub key from this repo and running the following command:

cosign verify --key cosign.pub ghcr.io/ublue-os/base

If you're forking this repo you should read the docs on keeping secrets in github. You need to generate a new keypair with cosign. The public key can be in your public repo (your users need it to check the signatures), and you can paste the private key in Settings -> Secrets -> Actions.

Warning

Disabling automatic updates is an unsupported configuration. If you reconfigure updates, you MUST be on the latest image before opening any issues.

With that said, you can individually disable which automatic update timers ublue-os/config provides with the following commands:

• flatpak system: sudo systemctl disable flatpak-system-update.timer
• flatpak user: sudo systemctl --global disable flatpak-user-update.timer

You can also configure automatic rpm-ostree updates by editing /etc/rpm-ostreed.conf and changing "AutomaticUpdatePolicy" to "none" or "check":

[Daemon]
AutomaticUpdatePolicy=check

See the documentation on how use this image in your own projects.