How to Install Nomacs on Ubuntu 22.04 or 20.04

Nomacs is a powerful, open-source image viewer offering extensive features, a lightweight design, and cross-platform compatibility. It stands out as a valuable tool for developers and users who need advanced capabilities for image processing tasks. This guide will demonstrate how to install Nomacs on Ubuntu 22.04 Jammy Jellyfish or Ubuntu 20.04 Focal Fossa using the command line terminal providing two methods: installation via the default Ubuntu repository (apt) or using Flatpak with Flathub.

  • Broad image format support: Nomacs supports popular formats like JPEG, PNG, and GIF, as well as raw camera formats and specialized formats such as PSD and XCF.
  • Fast and lightweight: Designed for resource efficiency, Nomacs ensures quick startup times and smooth performance on various hardware.
  • Advanced image editing tools: Nomacs offers essential functions like resizing, cropping, and rotating, along with advanced features like color adjustments and filtering options.
  • Batch processing: Save time and effort in your workflow by applying changes to multiple images simultaneously using Nomacs’ batch processing capabilities.
  • Synchronization: With its unique synchronization feature, Nomacs enables you to compare and synchronize multiple application instances for side-by-side image viewing.
  • Plugin support: Extend Nomacs’ functionality with plugins that offer additional tools and features for image editing and processing.
  • Cross-platform compatibility: Nomacs is available for Linux, Windows, and macOS, ensuring a consistent user experience across various operating systems.

In the following sections, the guide will walk you through the installation process of Nomacs on Ubuntu using two different methods.

Method 1: Install Nomacs with APT

The primary method to install Nomacs is through the apt command from Ubuntu’s default repository, which is suitable for most users and highly recommended.

To begin the installation, open the terminal and enter the following command:

sudo apt install nomacs

This command directs the system to utilize APT for obtaining and installing the Nomacs image viewer from Ubuntu’s default repository. If you prefer a more up-to-date version, consider using the Flatpak installation method with Flathub as your alternative choice.

Method 2: Install Nomacs with Flatpak and Flathub

An alternative method to install Nomacs is using Flatpak, a flexible package management system with a sandboxed application environment. To install Nomacs via Flatpak, you must add the Flathub repository containing the Nomacs package.

Note: If Flatpak isn’t installed on your system, please refer to How to Install Flatpak on Ubuntu with the Flatpak Team Official LaunchPAD PPA. This guide offers instructions for obtaining the latest supported version using the Flatpak Team Official LaunchPAD PPA.

Begin by opening the terminal and entering the following command to integrate the Flathub repository:

sudo flatpak remote-add --if-not-exists flathub

With the repository now integrated, you can proceed to install Nomacs by executing the command below:

flatpak install flathub org.nomacs.ImageLounge

This command will install the Nomacs image viewer using the Flatpak package management system, ensuring you have the most recent version from the Flathub repository.

How to Launch Nomacs

Once you’ve successfully installed Nomacs, there are a couple of ways to launch the image viewer. Firstly, you can open Nomacs directly from the terminal by typing:


For those who installed Nomacs using Flatpak, you’ll need to launch it with the following command in a terminal window:

flatpak run org.nomacs.ImageLounge

While launching from the terminal is an option, a more convenient approach is to use the desktop environment. To open Nomacs via the desktop, navigate to Activities > Show Applications and search for “nomacs”. Click on the Nomacs icon to launch the image viewer, and you’re all set to start exploring its features.

Example of nomacs application icon on Ubuntu desktop:

As a new user of Nomacs on Ubuntu Linux, you may find the following tips and tricks helpful for getting started and making the most of this versatile image viewer:

  • Familiarize yourself with the interface: Nomacs has a clean and intuitive interface, with a toolbar at the top, a thumbnail preview at the bottom, and file tree navigation on the left. Spend some time exploring the interface to understand where various tools and options are located.
  • Customize the appearance: Under Edit > Settings, you can customize the appearance and behavior of Nomacs. Adjust settings such as theme, background color, and thumbnail size to suit your preferences.
  • Learn keyboard shortcuts: Nomacs has a range of keyboard shortcuts that can help streamline your workflow. For example, use the arrow keys to navigate between images, Ctrl + ‘+’ and Ctrl + ‘-‘ to zoom in and out, and ‘F11’ to toggle fullscreen mode. Check the Help > Keyboard Shortcuts menu for a full list.
  • Synchronize multiple instances: Nomacs allows you to synchronize multiple instances for comparing images side by side. Open multiple program instances, select Window > Synchronize > Link All or Link Selected, and use the arrow keys to navigate simultaneously through images.
  • Explore editing features: Nomacs comes with basic image editing tools such as cropping, resizing, and rotating, as well as more advanced options like color adjustments and filtering. These tools can be accessed through the Adjustments and Tools menus.
  • Utilize batch processing: If you need to apply changes to multiple images, Nomacs supports batch processing. Go to Tools > Batch Processing, add the images you want to process, and choose the desired actions, such as resizing, renaming, or format conversion.
  • Extend the functionality with plugins: Nomacs supports plugins that enhance its capabilities. Visit the official Nomacs website to find and install plugins catering to your needs.

By following these tips and exploring the various features of Nomacs, you can effectively manage, edit, and enhance your images, making it an indispensable tool for image processing tasks on Ubuntu Linux.

Example of nomacs image editor on Ubuntu desktop:

Additional Tips

How to Update Nomacs

The process of updating Nomacs varies depending on your chosen installation method. To update the image viewer, use the appropriate command based on your installation method:

APT Update Method:

Keep your Nomacs installation up-to-date by running the following commands in the terminal:

sudo apt update
sudo apt upgrade

Flatpak Update Method:

For those who installed Nomacs using Flatpak, use the following command to update:

flatpak update

How to Remove (Uninstall) Nomacs

If you no longer need Nomacs and wish to uninstall it, use the command corresponding to your original installation method:

APT Remove Method:

For users who installed Nomacs with APT, enter the following command in the terminal to uninstall the application:

sudo apt remove nomacs

Flatpak Remove Method:

For those who installed Nomacs using Flatpak, execute the following command to remove it:

flatpak uninstall --delete-data org.nomacs.ImageLounge


In conclusion, installing Nomacs on Ubuntu provides users with a powerful and versatile image viewer that is both lightweight and feature-rich. With its wide range of supported formats, user-friendly interface, and advanced image editing capabilities, Nomacs is an excellent choice for developers and casual users. The two installation methods, APT and Flatpak, offer flexibility in choosing the most suitable approach based on user preferences and requirements. Following the outlined steps and tips for first-time usage, users can effectively manage, edit, and enhance their images, making Nomacs an indispensable tool in image processing tasks on Ubuntu Linux.

Additional Resources for Nomacs

To help you further explore and master Nomacs, we’ve compiled a list of additional resources that can provide valuable information and assistance:

  • Nomacs Official Website: The official Nomacs website ( offers comprehensive documentation, tutorials, and the latest news related to the image viewer. It is an excellent starting point for learning more about its features and capabilities.
  • Nomacs GitHub Repository: The Nomacs GitHub repository ( contains the source code, release notes, and issue tracking for the project. It is a valuable resource for developers who want to contribute to the project or report bugs.
  • Nomacs Plugins: To extend the functionality of Nomacs, check out the available plugins on the official website ( These plugins offer additional tools and features for image editing and processing.

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