Troubleshooting the Application not found error in Flatpak

The Application not found error may occur in Flatpak on your Linux system for a variety of reasons. This typically happens when the application you are trying to open is not actually installed, or if the installation has been damaged through moving system files or some other means. In this tutorial, we will look at several ways to troubleshoot the Application not found error in Flatpak.

In this tutorial you will learn:

  • How to list installed apps on Flatpak
  • How to install a Flatpak app
  • How to update installed Flatpak apps
  • How to reinstall a Flatpak application
  • How to reinstall Flatpak
Troubleshooting the Application not found error in Flatpak
Troubleshooting the Application not found error in Flatpak
Software Requirements and Linux Command Line Conventions
Category Requirements, Conventions or Software Version Used
System Any Linux distro
Software Flatpak package manager
Other Privileged access to your Linux system as root or via the sudo command.
Conventions # – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
$ – requires given linux commands to be executed as a regular non-privileged user

Troubleshooting the Application not found error in Flatpak



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Run through the step by step instructions below for help in resolving the Application not found error in Flatpak. Since there could be multiple causes for the error, we will go through several troubleshooting methods. One of them should definitely work for you.

  1. First, if receiving the Application not found error, ensure that the app you are trying to launch is actually installed. Also make sure that you are typing the name of it correctly – even if you misspell it by one character, Flatpak will not know which app you are trying to open, and give the error. Type the following command to see what Flatpak apps you have installed:
    $ flatpak list
    
    List of Flatpak apps that are currently installed
    List of Flatpak apps that are currently installed
  2. If you do not see the application that you were looking for, that means it is not installed. Search for it in your configured repos and then install it:
    $ flatpak search [app name]
    

    And…

    $ sudo flatpak install [repo] [app name]
    for example:
    $ sudo flatpak install flathub org.gimp.GIMP
    
  3. If you do see the application listed, but it is not launching, try updating it (and all other installed Flatpak apps):
    $ sudo flatpak update
    
  4. If it is still not working, you can try reinstalling the application. As an example, we will uninstall the GIMP application in Flatpak, and then reinstall it from the FlatHub repository:
    $ sudo flatpak remove org.gimp.GIMP
    $ sudo flatpak install flathub org.gimp.GIMP
    
  5. If you are still receiving the Application not found error in Flatpak when trying to launch one or more applications, then this could indicate an issue with your Flatpak installation itself. At this point, it is recommended to uninstall Flatpak completely, and then reinstall it.




    To reinstall Flatpak on Debian, Ubuntu, Mint, etc.:

    $ sudo apt install --reinstall flatpak
    

    To reinstall Flatpak on CentOS, Fedora, Alma, Rocky, etc.:

    $ sudo dnf install --reinstall flatpak
    

    To reinstall Flatpak on Arch Linux and Manjaro:

    $ sudo pacman -Sy flatpak
    

Closing Thoughts

In this tutorial, we saw how to troubleshoot the Application not found error in Flatpak on a Linux system. Most times, this is just a generic message that users receive when trying to launch an application that is not currently installed, or when fat fingering an application name. It is an easy fix in most cases, but in rare instances could indicate a problem with the app installation or with Flatpak itself, in which case it is recommended to reinstall the application, and as a last resort, Flatpak itself.



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