These instructions are for Fedora Silverblue, but they could be adapted to other immutable operating systems.

1) Install the Operating System.

2) Update to the latest atomic image:

    $ sudo rpm-ostree update
    $ sudo systemctl reboot

3) Install build tools (necessary to compile the nxusb module for USB forwarding):

    $ sudo rpm-ostree install make automake gcc gcc-c++ kernel-devel kernel-headers
    $ sudo systemctl reboot
    $ sudo mkdir -p /var/nomachine

4) Download the NoMachine tar.gz (X86_64) package from the NoMachine web site and extract it:

    $ cd <DOWNLOAD_DIR>
    $ tar xfz nomachine_8.11.3_4_x86_64.tar.gz
    $ cd NX

5) By default the NoMachine package installs in /usr/NX. Override the default behavior and install the package in a writable directory by using the NX_INSTALL_PREFIX variable, for example:

    $ sudo NX_INSTALL_PREFIX=/var/nomachine ./nxserver --install
    NX> 700 Starting installation at: Tue, 26 Mar 2024 09:44:51.
    NX> 700 Using installation profile: Fedora.
    NX> 700 Installation log is: /var/nomachine/NX/var/log/nxinstall.log.
    NX> 700 Installing nxrunner version: 8.11.3.
    xdg-icon-resource: No writable system icon directory found.
    NX> 700 Runner install completed with warnings.
    NX> 700 Please review the install log for details.
    NX> 700 Installing nxplayer version: 8.11.3.
    NX> 700 Installing nxnode version: 8.11.3.
    /bin/cp: cannot create regular file '/usr/share/polkit-1/actions/org.freedesktop.packagekit.system-network-proxy-configure.policy': Read-only file system
    /bin/chmod: cannot access '/usr/share/polkit-1/actions/org.freedesktop.packagekit.system-network-proxy-configure.policy': No such file or directory
    /bin/cp: cannot create regular file '/usr/share/polkit-1/actions/org.freedesktop.packagekit.policy': Read-only file system
    /bin/chmod: cannot access '/usr/share/polkit-1/actions/org.freedesktop.packagekit.policy': No such file or directory
    /bin/cp: cannot create regular file '/usr/share/polkit-1/rules.d/55-org.nomachine.rules': Read-only file system
    NX> 700 Installing nxserver version: 8.11.3.
    NX> 700 ERROR: Cannot copy: /var/nomachine/NX/scripts/systemd/nxserver.service to: /lib/systemd/system/.
    NX> 700 Cannot restore selinux context for: /lib/systemd/system/nxserver.service.
    NX> 700 ERROR: Cannot enable systemd service: nxserver.service.
    NX> 700 ERROR: Cannot enable systemd service: .
    NX> 700 Server install completed with warnings.
    NX> 700 Please review the install log for details.
    NX> 700 Installation completed with errors at: Tue, 26 Mar 2024 09:45:09.
    NX> 700 NoMachine was configured to run the following services:
    NX> 700 NX service on port: 4000

6) Installation completes with some errors, it's then necessary to copy manually the Systemd service file to the /etc/systemd/system/ folder:

    $ sudo cp /var/nomachine/NX/scripts/systemd/nxserver.service /etc/systemd/system/

7) Enable and start the nxserver service:

    $ sudo systemctl enable --now nxserver

    If your NoMachine server is not the free version and accepts connections by SSH protocol, do also the following

8) Enable and start the sshd service:

    $ sudo systemctl enable --now sshd

9) Try to connect ot this machine by the NoMachine client, you should now be able to authenticate to Fedora Silverblue and connect to the desktop.