Discover updates vs unattended

Help
1

Hi everyone,

I’m trying to better understand how system updates are handled on Kubuntu and I’m a bit confused about the roles of the different mechanisms.

From what I see, there are updates managed through KDE Discover (including automatic updates settings), and on the other hand there is unattended-upgrades coming from Ubuntu.

Could someone clarify the actual differences between these two systems in practice?

Specifically:

  • What types of updates are handled by Discover vs unattended-upgrades?
  • Do they overlap or do they target different parts of the system?
  • What are the risks to enable both automatic updates in Discover and unattended-upgrades at the same time on Kubuntu, or can that lead to conflicts or redundancy?
  • Which one is better for a stable Kubuntu setup?

Thanks in advance for the clarification.

2

Ubuntu’s automatic updating system is formally called unattended-upgrades. (Actually, it is Debian’s). It can either tell apt to download updates in the background, or if configured, to automatically install them, as well as many other options.
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This is only for deb based updates. In Ubuntu desktop “Flavours”, it is configured out of the box to download and automatically install security updates specifically. This is not a new thing. What has changed is that Apt itself has seen a pretty big update, and it shows more info on what is going on, including mentions of the automatically installed things

Plasma Discover supports updating Debs, Flatpaks, Snaps, KDE store items, and even some firmware updates. This is completely separate and not connected to the unattended-upgrades mechanism. Discover is just a GUI that can do some apt things. Any setting for Discover (in System Settings) is specific to what Discover will do.

Yes, it is confusing, for sure. Ubuntu isn’t the only thing using Debian’s apt, and IIRC these may not use any of the unattended-upgrades features out of the box.

Also, this setting for Discover is distro-agnostic, so it does similar things on other distro’s packaging systems, iirc, which might not have this as a native feature.

You can adjust the unattended-upgrades settings using a GUI via Discover>> Settings >> the Software Sources button on the right side, in the Ubuntu 26.04 section.

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So: tl;dr:

  • Unattended updates will install Ubuntu security updates automatically in the background. Just security updates.

  • Discover’s setting will have it install all updates automatically, or at least all the native packages, iirc (I am unsure if this includes Flatpaks/snaps/etc. The other options in System Settings do not involve these)

  • These are competing things, but they probably wouldn’t get in each other’s way.

  • If you want to use automatic updates for all your debs, imo, use the distro’s native tools, not Discover. Or test each out and use the one you prefer.