Application Packaging / Application Distribution

.AppImage

  • It's a portable executable application format—essentially a self-contained app that usually doesn't require installation.

  • Is designed to work on any Linux distribution, but with some conditions and limitations.

  • Aims to be distribution-agnostic, meaning:

    • Works on Ubuntu, Debian, Fedora, Arch, openSUSE, etc.

    • Doesn't require package managers ( apt , dnf , pacman , etc.).

    • Self-contained with most libraries bundled.

    • But:

      • If your distro is very old, newer AppImages might not run.

  • Dependencies :

    • FUSE (File System in Userspace) may be needed.

    • On modern systems with AppImage type 2 , FUSE is not required.

  • Running : 

    ./AppName.AppImage

  • If it fails, check for missing libraries : 

    ldd ./AppName.AppImage

  • Execution permission :

    • You must set the file as executable: 

    chmod +x AppName.AppImage

Flatpak

  • It's an universal package/distribution system with sandboxing and runtimes.

  • It takes the opposite approach from traditional Linux.

  • Instead of saying "Applications can access your home directory", it says "Applications live inside a sandbox. They only see what we allow."

  • Example :

    • Suppose you install Godot.

    • Inside the sandbox, the application sees something like 

    /
├── app/
├── usr/
├── etc/
├── home/
│   └── user/
└── tmp/

    • This isn't your real filesystem.

    • It's a virtual filesystem assembled by Flatpak using Linux namespaces and bind mounts.

Snap

  • It's an universal package/distribution system with sandboxing, developed by Canonical.