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Choose Kubuntu if you want the KDE Plasma desktop, its customization approach and KDE apps such as KDE Connect. Choose Ubuntu if you prefer Ubuntu Desktop’s defaults. Both are official Ubuntu flavors built on the Ubuntu ecosystem; the main difference is the desktop experience and included applications, not a universally better or faster system.
What is the difference between Ubuntu and Kubuntu?
Ubuntu and Kubuntu are official Ubuntu flavors. Canonical describes flavors as versions of Ubuntu that choose their own default applications and settings while drawing on the Ubuntu archive. They are related distributions, not unrelated operating systems.
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| What you are choosing | Ubuntu | Kubuntu |
|---|---|---|
| Default desktop | Ubuntu Desktop’s default environment | KDE Plasma |
| Default applications | Ubuntu Desktop’s included applications and settings | A Qt-based application set, with productivity, office, email, graphics, photography and music apps |
| Notable integration | Not established in the cited flavor overview | KDE Connect, for connecting a PC with a phone or tablet |
| Shared foundation | Ubuntu archive | Ubuntu archive |
For the official overviews, see Ubuntu flavors and Ubuntu releases.
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Choose Kubuntu if KDE Plasma fits how you work
Kubuntu is the natural starting point if you want KDE Plasma and its desktop tools, prefer its customization approach, or expect to use KDE Connect to link your computer and phone or tablet. Its default application set is Qt-based.
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Choose Ubuntu if you want Ubuntu Desktop’s defaults
If you are content with Ubuntu Desktop’s default interface and applications, choose Ubuntu. There is no evidence here that one flavor is universally easier, faster or better; the meaningful distinction is which desktop and default apps suit you.
How do release and support periods compare?
Ubuntu releases a new version every six months. Long-term support (LTS) releases arrive every two years. Canonical’s published policy gives Ubuntu LTS releases five years of standard security maintenance for packages in the Main component; interim releases receive nine months of updates. Those are Ubuntu lifecycle figures, not a guarantee that Kubuntu has the same support end date.
Canonical says flavors generally support LTS releases for three years, with exceptions. Check the support information for the specific Kubuntu release you plan to install rather than transferring Ubuntu’s published date to Kubuntu.
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As of October 7, 2026, Canonical lists Ubuntu 26.04 LTS, released in April 2026, with standard security maintenance through May 2031, and Ubuntu 24.04 LTS, released in April 2024, through May 2029. These dates are for Ubuntu’s lifecycle listings; they are not confirmed Kubuntu support dates. See Canonical’s Ubuntu release cycle and the Ubuntu releases documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do you need to install either flavor?
Both flavors are distributed as ISO installation images. If you need physical installation media, a USB flash drive can be useful; the cited guidance does not establish a required capacity or specific model. Before installing, choose the flavor and release, then check that release’s official download and support information.
Quick Recap
- Decide whether you want Ubuntu Desktop or KDE Plasma and its default apps.
- Check the support information for the exact release, especially for Kubuntu.
- Use a USB flash drive only if you need to create physical installation media.
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