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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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Fifth LTS (Long Term Support) release of Ubuntu, code-named "Trusty Tahr". Released on 17th April, 2014. Will go End Of Life (EOL) April 2019. Only use this tag if your question is version-specific.
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Sixth LTS (Long Term Support) release of Ubuntu, code-named "Xenial Xerus". Released on 21st April, 2016. Will go End Of Life (EOL) April 2021. Only use this tag if your question is version-specific. …
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Fourth LTS (Long Term Support) release of Ubuntu, code-named Precise Pangolin. Released on 26th April, 2012, no longer supported (EOL) since 28th April 2017. Questions about unsupported versions are l…
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if you have trouble booting Ubuntu or you have questions about the bootup process.
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Questions about using the command-line interface (CLI).
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Managing and using network connectivity on a Ubuntu system
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For questions regarding the installation of two or more operating systems on a single computer.
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For questions related to modules, the ones that control and orchestrate how the kernel should communicate with the hardware
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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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Questions related to Ubuntu Server, and server-related packages.
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Questions about using Wireless connections in Ubuntu. This tag is not limited to Wifi only.
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For questions regarding the Unity desktop environment, including configuring and using Unity. Unity has been the default Ubuntu desktop environment from Ubuntu 11.04 to Ubuntu 17.04.
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the next generation of the GRand Unified Bootloader (GRUB). Ubuntu has used GRUB 2 as the boot loader since 9.10 (Karmic Koala). Commonly referred to as simply "GRUB".
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the act of dividing a hard disk drive into multiple logical storage units referred to as 'partitions'
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Questions related to the NVIDIA graphics and motherboard chipsets and the related drivers.
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GNOME (GNU Network Object Model Environment) is a collection of GTK-based software that provides the desktop environment GNOME Shell. This is a very general tag that should only be used for questions …
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the shell used in Ubuntu's command-line interface by default.
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**DO NOT USE THIS TAG**. Use either [tag:system-installation] (for system installs) or [tag:software-installation] (for installing software on a running system). Questions about installing Ubuntu, or …
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Questions about installing Ubuntu in any supported architecture. Post-installation questions should not be under this tag.
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Questions about the management of software packages, in particular the APT and dpkg systems.
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Installing software on a running system, either as binaries or from source.
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Questions about upgrading packages, systems or hardware.
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an acronym for Universal Serial Bus. The current USB standard is USB 3.0, which supports transfer speeds of up to 625 MB/s. USB devices are plug-and-play.
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Questions about sound issues with Ubuntu spanning from sound cards, microphones and speakers/headset to the transfer of audio signals via audio port, bluetooth and HDMI.
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Seventh LTS (Long Term Support) release of Ubuntu, code-named "Bionic Beaver". Released on 26th April, 2018. Will go End Of Life (EOL) April 2023. Only use this tag for version-specific questions.
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Questions concerning the Linux kernel in Ubuntu. Issues may including upgrading and installing kernels, compiling, patches, and kernel modules.
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Short for "file system permissions" - access control based on user, group, or global access.
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Codenamed "Oneiric Ocelot", this version was released on Oct 13, 2011 and is no longer supported since May 9, 2013. Questions about unsupported versions are likely to be closed as off-topic.
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Questions about mounting filesystems, such as those on internal drives or on CDs, DVDs, external hard drives or USB flash drives, or about using the `mount` command.
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a very general tag. If you have a tag that's more specific (e.g. the package name that your question is about) please use that one.
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a series of instructions written in a "plain text" file. The script interpreter (for example, Bash or another shell, Python, Perl, Ruby, etc.) reads the file and carries out the instructio…
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Questions related to graphics, in particular getting graphics cards to work. Please tag your exact graphics card version as well if you know what it is.
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a platform-independent open-source virtualization software available for Linux, OS X, Solaris and Windows hosts. Guest additions need to be installed to automatically adjust the guest sc…
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a method for securely connecting to a remote computer.
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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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a community developed, Ubuntu-based (Ubuntu with XFCE desktop environment) GNU/Linux operating system.