PIXEL Desktop Environment

Raspberry Pi - Desktop Environment

When you install Raspberry Pi OS with Desktop, you get a graphical user interface (GUI) that makes interacting with your Pi feel similar to using a standard Windows or macOS computer. While historically referred to as PIXEL (Pi Improved Xwindows Environment, Lightweight), it’s now generally just called the Raspberry Pi Desktop. It’s typically based on the LXDE (Lightweight X11 Desktop Environment) or, more recently, experimental versions using LXQt or Wayfire, providing a balance between functionality and performance suitable for the Pi’s hardware.

Navigating the Desktop

The desktop environment consists of several key elements:

Desktop Background (Wallpaper): The main area where icons for files or shortcuts can be placed.
Taskbar (Panel): Typically located at the top of the screen. It contains the Application Menu, shortcuts, running application indicators, and system tray icons.
Application Menu: Accessed by clicking the Raspberry Pi logo in the top-left corner. It organizes installed applications into categories.
System Tray: Usually in the top-right corner, containing icons for network connections (Wi-Fi/Ethernet), Bluetooth, audio volume, clock, and safe removal of devices.

Task Manager

If your Raspberry Pi seems unresponsive or a program freezes, the Task Manager can help you identify and stop problematic processes. You can usually find it in the Application Menu under Accessories or System Tools (often called ‘Task Manager’ or similar).

Alternatively, you can use the keyboard shortcut Ctrl+Alt+Delete (this may vary slightly depending on the OS version).

The Task Manager displays a list of running processes and their resource usage (CPU, Memory). You can right-click a non-responding program and choose ‘End Process’ or ‘Kill Process’ to terminate it. ‘End Process’ attempts a graceful shutdown, while ‘Kill’ forces termination immediately (potentially losing unsaved data).

A CPU usage monitor might also be visible on the taskbar, indicating how busy the processor is.

File Manager

Managing files is much easier with the graphical File Manager (typically pcmanfm). You can find it via an icon on the taskbar (often looks like a folder) or in the Application Menu under Accessories.

The File Manager allows you to browse folders, view files, copy, paste, rename, delete, and manage permissions visually.

Navigating the File Manager

Sidebar: Often shows shortcuts to common locations (Home folder, Desktop, Documents, Downloads, mounted drives).
Toolbar: Contains buttons for navigation (Back, Forward, Up), creating new folders/files, changing view modes, and sometimes a location bar showing the current path.
Main Pane: Displays the contents of the selected folder.
Tabs: Like web browsers, you can open multiple folders in different tabs for easy switching.

Basic Operations

Opening: Double-click a folder to enter it or a file to open it with its default application.
Selection: Click a file/folder to select it. Hold Ctrl and click to select multiple individual items. Click the first item, hold Shift, and click the last item to select a range. Click and drag a box around items to select them.
Cut/Copy/Paste: Right-click an item (or use Ctrl+X for cut, Ctrl+C for copy) and then right-click in the destination folder and choose Paste (or use Ctrl+V). Copying creates a duplicate; cutting moves the original.
Rename: Right-click an item and select ‘Rename’ or select it and press F2.
Delete: Right-click an item and select ‘Move to Wastebasket’ (or ‘Delete’ if bypassing the wastebasket) or select it and press the Delete key. Items in the Wastebasket can usually be restored unless emptied.
Create Folder/File: Right-click an empty space in a folder and choose ‘Create New…’ -> ‘Folder’ or ‘Empty File’.

Views and Sorting

You can change how files are displayed using the View menu or toolbar buttons (e.g., Icon View, List View, Detailed View). You can also sort files by clicking column headers (in list/detailed views) or using the View -> Arrange Items menu.

Web Browsing

Raspberry Pi OS typically comes with Chromium pre-installed, which is the open-source basis for Google Chrome. It offers a modern browsing experience with support for extensions and web standards. You can find it via the Globe icon on the taskbar or in the Internet section of the Application Menu.

Other browsers like Firefox ESR might be available for installation via the package manager.

Email

While older versions included Claws Mail, the most common way to access email now is through webmail using the Chromium browser. Alternatively, you can install desktop email clients like Thunderbird using the package manager (sudo apt install thunderbird).

Image Viewer

Raspberry Pi OS includes a basic Image Viewer (often gpicview or similar) found under Accessories or Graphics. Double-clicking an image file usually opens it. The viewer typically provides options for zooming, rotating, flipping, basic slideshows, and navigating between images in the same folder.

Text Editor

For simple text editing (like configuration files or quick notes), Raspberry Pi OS includes a lightweight editor like Mousepad or Geany (which is also a simple IDE). You can find it under Accessories. These editors support basic text manipulation, syntax highlighting for code, and find/replace functionality.

For programming, the Thonny Python IDE (under Programming) is specifically recommended for beginners.

Customizing Your Desktop

You can personalize the look and feel via the Preferences -> Appearance Settings menu (or similar). This allows you to change the wallpaper, icon theme, font, and interface colors.

Installing New Applications

Besides using the command line (apt), you can often find a graphical tool for managing software under Preferences -> Add/Remove Software (or similar). This tool lets you browse categories, search for applications, and install or remove them with a few clicks. You’ll usually need to enter your password to authorize changes.

Backing Up Data

Regularly back up your important files! You can manually copy files to a USB drive using the File Manager. Raspberry Pi OS also includes an ‘SD Card Copier’ tool (under Accessories) which can clone your entire MicroSD card to another card or a USB-connected card reader – useful for creating a full system backup.