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Flatpak — Universal Package Management for Linux Applications

Flatpak is a universal package management system designed to distribute Linux desktop applications across different Linux distributions. It packages applications with their required runtimes, runs them in isolated sandboxes, and enables developers to distribute software independently of the underlying operating system. Flatpak is widely used on desktop Linux systems and is an excellent alternative to Snap for cross-distribution software deployment.

Learning Path

Linux Mastery → Module 7: Package Management → Lesson 6

Difficulty: Beginner → Intermediate

Reading Time: 55 Minutes

Course Progress

Course: Linux Mastery

Module: Package Management

Lesson: 6 of 10

What You'll Learn

After completing this lesson, you'll be able to:

  • Understand Flatpak
  • Install Flatpak
  • Configure Flatpak repositories
  • Install applications
  • Update and remove applications
  • Understand Flatpak runtimes
  • Compare Flatpak with Snap
  • Apply Flatpak in real-world environments

Prerequisites

Complete:

  • Module 1 – Linux Fundamentals
  • Module 2 – Linux Command Line Essentials
  • Module 3 – Text Processing
  • Module 4 – File Management and Permissions
  • Module 5 – Users and Groups
  • Module 6 – Process Management
  • Module 7 Lessons 1–5

Why Learn Flatpak?

Imagine you want to install:

  • Visual Studio Code
  • Discord
  • Spotify
  • LibreOffice
  • OBS Studio
  • GIMP

Different Linux distributions have different package managers.

Wouldn't it be useful if one package worked on all of them?

That's exactly what Flatpak provides.

What is Flatpak?

Flatpak is a universal package management system that enables applications to run consistently across multiple Linux distributions.

Each Flatpak application includes:

  • Application binaries
  • Required libraries
  • Metadata
  • Permissions
  • Runtime information

Applications execute inside isolated sandboxes.

How Flatpak Works

Flatpak Repository
        │
        ▼
Download Application
        │
        ▼
Install Runtime
        │
        ▼
Install Application
        │
        ▼
Run Inside Sandbox

What is a Runtime?

Unlike Snap,

Flatpak separates:

Application

↓

Runtime

A runtime is a shared collection of libraries used by multiple Flatpak applications.

Benefits:

  • Reduced disk usage
  • Faster downloads
  • Shared dependencies
  • Easier updates

Install Flatpak

Ubuntu/Debian:

sudo apt install flatpak

RHEL/Rocky/AlmaLinux:

sudo dnf install flatpak

Fedora:

sudo dnf install flatpak

Add the Flathub Repository

Flathub is the most popular Flatpak application repository.

flatpak remote-add --if-not-exists flathub \
https://flathub.org/repo/flathub.flatpakrepo

View Configured Repositories

flatpak remotes

Example:

flathub

Search for Applications

Search for VLC.

flatpak search vlc

Example:

VLC

Media Player

Install an Application

Install VLC.

flatpak install flathub org.videolan.VLC

Install GIMP.

flatpak install flathub org.gimp.GIMP

Install LibreOffice.

flatpak install flathub org.libreoffice.LibreOffice

Run an Application

flatpak run org.videolan.VLC

List Installed Applications

flatpak list

Example:

Application

Version

Runtime

Update Applications

Update all installed Flatpak applications.

flatpak update

Update a specific application.

flatpak update org.videolan.VLC

Remove an Application

flatpak uninstall org.videolan.VLC

Remove Unused Runtimes

flatpak uninstall --unused

This removes runtimes that are no longer required.

View Application Information

flatpak info org.videolan.VLC

Displays:

  • Version
  • Runtime
  • Installation location
  • Permissions

List Installed Runtimes

flatpak list --runtime

View Permissions

Display application permissions.

flatpak info --show-permissions org.videolan.VLC

Override Permissions

Grant access to the Downloads directory.

flatpak override \
--filesystem=~/Downloads \
org.videolan.VLC

Common Commands

Search applications.

flatpak search gimp

Install application.

flatpak install flathub org.gimp.GIMP

Run application.

flatpak run org.gimp.GIMP

Update applications.

flatpak update

Remove application.

flatpak uninstall org.gimp.GIMP

Real Production Examples

Install Visual Studio Code.

flatpak install flathub com.visualstudio.code

Install OBS Studio.

flatpak install flathub com.obsproject.Studio

Install Discord.

flatpak install flathub com.discordapp.Discord

Install GIMP.

flatpak install flathub org.gimp.GIMP

Production Perspective

Flatpak is commonly used for:

  • Linux desktop systems
  • Developer workstations
  • Cross-distribution software deployment
  • GUI applications
  • Open-source desktop software
  • Educational environments

Traditional package managers remain the preferred choice for core operating system packages and server software.

Hands-on Lab

Task 1

Install Flatpak.

sudo apt install flatpak

Task 2

Add the Flathub repository.

flatpak remote-add --if-not-exists flathub \
https://flathub.org/repo/flathub.flatpakrepo

Task 3

Verify configured repositories.

flatpak remotes

Task 4

Search for VLC.

flatpak search vlc

Task 5

Install VLC.

flatpak install flathub org.videolan.VLC

Task 6

List installed applications.

flatpak list

Task 7

Update installed applications.

flatpak update

Task 8

Remove VLC.

flatpak uninstall org.videolan.VLC

Command Deep Dive

Command Purpose Production Example
flatpak search Search applications Software discovery
flatpak install Install application Deployment
flatpak run Launch application Daily usage
flatpak update Update applications Maintenance
flatpak uninstall Remove application Cleanup
flatpak list List installed applications Inventory
flatpak remotes List repositories Repository management
flatpak info Display application details Verification

Flatpak vs Snap

Feature Flatpak Snap
Universal Package Format ✅ ✅
Sandboxed Applications ✅ ✅
Automatic Updates Manual (flatpak update) by default Automatic by default
Shared Runtimes ✅ ❌ (bundled dependencies)
Primary Focus Desktop applications Desktop and server applications
Popular Repository Flathub Snap Store

Production Troubleshooting Scenario

Scenario

A developer installs GIMP using Flatpak.

flatpak install flathub org.gimp.GIMP

The application cannot access files in the user's Documents folder.

Investigation:

flatpak info --show-permissions org.gimp.GIMP

The required filesystem permission is missing.

Solution:

flatpak override \
--filesystem=~/Documents \
org.gimp.GIMP

The application can now access the required files.

Best Practices

  • Use Flathub as the primary Flatpak repository.
  • Keep applications and runtimes updated.
  • Remove unused runtimes periodically.
  • Review application permissions before granting additional access.
  • Use Flatpak primarily for desktop applications rather than core operating system components.

Common Mistakes

❌ Forgetting to add the Flathub repository.

✅ Remember to to add the Flathub repository.

❌ Leaving unused runtimes installed.

✅ Do not leave unused runtimes installed.

❌ Granting excessive filesystem permissions to applications.

✅ Avoid this mistake: granting excessive filesystem permissions to applications.

❌ Using Flatpak for packages better managed by the system package manager.

✅ Avoid using Flatpak for packages better managed by the system package manager when a safer approach exists.

Interview Questions

Beginner

  1. What is Flatpak?
  2. What is Flathub?
  3. Which command installs a Flatpak application?
  4. How do you list installed Flatpak applications?

Intermediate

  1. What is a Flatpak runtime?
  2. How do you update Flatpak applications?
  3. How do you remove unused runtimes?
  4. How do you view application permissions?

Architect Level

  1. When would you choose Flatpak over Snap?
  2. Why are shared runtimes beneficial?
  3. How does Flatpak improve application security?

Summary

In this lesson, you learned:

  • Flatpak package management
  • Installing applications
  • Flathub repositories
  • Shared runtimes
  • Application permissions
  • Updating applications
  • Sandboxing
  • Production best practices

Flatpak provides a secure and portable method for distributing desktop applications across Linux distributions. By separating runtimes from applications and using sandboxing, Flatpak delivers efficient software management while improving compatibility and security.

Key Takeaways

  • Flatpak is a universal package management system.
  • Flathub is the primary repository for Flatpak applications.
  • Flatpak uses shared runtimes to reduce duplication.
  • Applications run inside secure sandboxes.
  • Use flatpak install to install applications.
  • Use flatpak update to keep applications current.

What's Next?

Repository Management — Managing Software Sources in Linux

You'll explore:

  • What software repositories are
  • Repository configuration
  • Adding and removing repositories
  • GPG keys and package verification
  • Repository priorities
  • Enterprise repository management
  • Best practices for production systems

Understanding repository management is essential for securely controlling where your Linux systems obtain software updates and packages.