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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Questions specific to elementary OS 0.4, codenamed "Loki". Loki is the current stable version of elementary OS.
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Questions specific to elementary OS 0.3, codenamed "Freya". Freya has been superseded by Loki.
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Questions about installing elementary OS in any supported architecture. Post-installation questions should not be under this tag.
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for questions about updates and issues after updating
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Questions about the bootup process in elementary OS. Use this tag if you have trouble booting elementary OS or you have questions about the bootup process.
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should be used for display and video related issues. Questions about hardware issues and what display to buy are off-topic.
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Questions about wingpanel, the bar that appears at the top of the screen. This includes both regular usage, and customization.
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options in a program that allow you to configure the program to suit your needs.
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a networking technology permitting the exchange of information through wireless (radio) connections.
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Questions about the default file manager, Files (also known as Pantheon Files), which can be used to perform all file management tasks, including accessing the entire file system.
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Questions about installing software, either as binaries or from source code, as well as using the Software Center.
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Questions about software that runs on elementary OS. This includes the default applications like Files and Mail, and also apps from the software center and those downloaded manually.
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for networking and internet related issues in elementary OS
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the operating system's lock/login screen. It is handled by the LightDM display manager and known as "Pantheon Greeter" in elementary OS, though other greeters are available.
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For questions regarding the function of the entire operating system and issues that affect users system-wide.
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the elementary OS app for entering text commands, formally known as Pantheon Terminal. For the Ubuntu terminal, use "gnome-terminal".
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Questions about keyboards, both touch and otherwise. However, please add the "touchscreen" tag for touchscreen keyboard questions.
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Questions about keyboard shortcuts: both which ones to use and how to create custom shortcuts.
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The elementary OS app store (replaces the Ubuntu Software Center).
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Questions about the graphics driver — system software that controls a computer's video adapter (aka graphics card) or GPU.
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elementary OS's default dock. It shows active applications and is usually found at the bottom of the screen.
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For questions regarding the installation of two or more operating systems on a single computer.
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Questions related to the configuration and activation of touchpad / trackpads.
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a set of unifying concepts used by graphical user interfaces to help users more easily interact with the computer.
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Questions about issues relating to drivers on elementary OS.
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Questions about sound issues with elementary OS spanning from sound cards, microphones and speakers/headset to the transfer of audio signals via audio port, bluetooth and HDMI.
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for issues relating to Bluetooth on elementary OS
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Questions relating to Pantheon, elementary OS's desktop shell.
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about changing the appearance of elementary OS and its applications. For questions about functionality, use application-specific tags.
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The pointing device (generally referred to as the mouse). When referring to laptops, please specify if it is the trackpad and not an external mouse by using the trackpad tag.
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the GRand Unified Bootloader, a BootLoader that can be used to boot most operating systems.
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Questions relating to NVIDIA GPUs on elementary OS.
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Advanced Packaging Tool, the package manager for Debian-based distributions. It is also the most used tool for installing packages in Ubuntu. Questions about using any of the apt tools should use this…
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For questions concerning the elementary OS kernel (which is the same as Ubuntu's kernel), including compiling, and questions relating to modules
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default email client in elementary OS (formerly known as Geary)
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for any question about the images that represent applications. These images show up in Slingshot and Plank. Questions can be about duplicates, icon packs, low quality icons and more.