What Dolphin is and why you might install it

Dolphin is a file manager — the program that lets you browse folders, move files around, and organize what's on your computer. It comes built into KDE Plasma, which is one of the main desktop environments for Linux. If you are already running KDE Plasma, Dolphin is already there. If you use a different desktop environment like GNOME or XFCE, you can install Dolphin separately without switching your whole desktop.

You might want to do this because Dolphin has features some people prefer: split-pane view (two folders side by side), built-in preview of images and documents, and tight integration with KDE's other tools. It is also lightweight enough to run on older machines. The trade-off is that installing it on a non-KDE desktop means you will have some KDE libraries running in the background even when you are not using Dolphin, which takes a small amount of disk space and memory.

Key Takeaways

  • Dolphin comes pre-installed on KDE Plasma; you only need to install it separately if you use GNOME, XFCE, or another desktop environment.
  • Installation on Ubuntu, Fedora, Debian, and Arch uses your distribution's package manager — one command line, no manual downloads.
  • After installation, Dolphin appears in your applications menu and can be set as your default file manager in your system settings.
  • Dolphin will pull in KDE libraries as dependencies, which adds roughly 100–300 MB of disk space depending on what is already installed.

Installation on Ubuntu and Debian-based systems

Open a terminal and run this command:

sudo apt update && sudo apt install dolphin

The system will show you a list of packages it is about to read and ask you to confirm by typing y and pressing Enter. This downloads Dolphin and all the KDE libraries it needs. On a fresh system, this can take a few minutes depending on your internet speed. When it finishes, Dolphin is ready to use.

If you want to remove it later, run sudo apt remove dolphin. The KDE libraries will stay behind; if you want to remove those too, run sudo apt autoremove, though this will only remove libraries that nothing else is using.

Installation on Fedora and Red Hat-based systems

Open a terminal and run:

sudo dnf install dolphin

Fedora's package manager (dnf) will read Dolphin and its dependencies. You do not need to run an update command first the way you do on Debian-based systems. When the read finishes, Dolphin is installed and ready.

To remove it, run sudo dnf remove dolphin. Like apt, dnf will leave the KDE libraries behind unless you explicitly clean them up with sudo dnf autoremove.

Installation on Arch Linux

Run this command in a terminal:

sudo pacman -S dolphin

Pacman will show you the packages it plans to install and ask for confirmation. Press y to proceed. Arch's package manager is often faster than apt or dnf because Arch packages are usually smaller and more minimal.

To remove Dolphin later, run sudo pacman -R dolphin. Pacman does not automatically remove unused dependencies the way apt and dnf do, so if you want to clean up the KDE libraries, you will need to remove them by name or use sudo pacman -Rns dolphin to remove Dolphin and all packages that depend only on it.

Opening Dolphin and setting it as your default

After installation, Dolphin appears in your applications menu. On most desktops, you can search for it by pressing the Super key (Windows key) and typing "dolphin", then pressing Enter. The first time you open it, it may take a few seconds to load because KDE libraries are starting up for the first time.

To make Dolphin your default file manager, right-click on a folder in whatever file manager you are currently using and look for "Open With" or "Properties". Select Dolphin from the list and choose "Set as Default" if that option appears. Alternatively, open your system settings, search for "File Manager" or "Default Applications", and select Dolphin from the dropdown.

What happens after installation

Dolphin stores its settings in a hidden folder in your home directory called .config/dolphinrc. If you customize things like split-pane layout, keyboard shortcuts, or toolbar buttons, those changes are saved there. If you ever remove and reinstall Dolphin, those settings stay behind, so your preferences will be there when you install it again.

The first time Dolphin runs, it may index your home directory to enable fast searching. This is normal and happens in the background. You can use Dolphin while this is happening, though searching may be slower until the index is complete.

Troubleshooting common installation issues

If you get a "command not found" error when trying to install, make sure you included sudo at the start of the command and that you are using the correct package manager for your distribution. Running which apt, which dnf, or which pacman will tell you which one is installed.

If Dolphin installs but does not appear in your applications menu, try logging out and logging back in, or restarting your computer. Some desktops do not refresh the applications menu when ready after a new package is installed. If it still does not appear, open a terminal and type dolphin to launch it directly — if it opens, the installation worked and it is just a menu caching issue.

If Dolphin is very slow to open, it may be because your system is indexing files or because you have a very large home directory. Let it run for a minute or two the first time. If it remains slow, you can disable indexing in Dolphin's settings under Tools → Configure Dolphin → General → Show Detailed Tooltips and uncheck "Enable file indexing".

Frequently Asked Questions

Do I need to uninstall my current file manager before installing Dolphin?

No. You can have multiple file managers installed at the same time. Dolphin will coexist with GNOME Files, Thunar, or whatever came with your desktop. You can choose which one to use by right-clicking a folder and selecting "Open With", or set a default in your system settings.

Will installing Dolphin slow down my computer?

Dolphin itself is lightweight, but it brings KDE libraries with it, which add roughly 100–300 MB of disk space. If those libraries are not already on your system, they will use a small amount of RAM when Dolphin is running — usually 20–50 MB. On modern computers this is not noticeable. On older machines with very limited RAM, you might see a small slowdown the first time you open it.

Can I uninstall KDE Plasma but keep Dolphin?

Yes. Dolphin does not require the full KDE Plasma desktop — it only needs the KDE libraries. You can remove KDE Plasma with your package manager and Dolphin will stay installed and work fine. However, removing KDE Plasma may also remove Dolphin if your system considers them tightly linked; check what your package manager says it will remove before confirming.

What is the difference between Dolphin and the file manager that came with my desktop?

Dolphin has split-pane view, better preview support, and more customization options. GNOME Files is simpler and uses less memory. Thunar (XFCE's file manager) is very lightweight. There is no "best" choice — it depends on whether you value features or simplicity. You can install Dolphin and try it without removing anything else.

How do I update Dolphin after I install it?

Dolphin updates as part of your regular system updates. On Ubuntu or Debian, run sudo apt update && sudo apt upgrade. On Fedora, run sudo dnf upgrade. On Arch, run sudo pacman -Syu. You do not need to do anything special for Dolphin — it updates along with everything else.