Kubuntu keeps installing updates automatically despite configured to manual

[libcha]

Using KDE Systemsettings, I have configured my Kubuntu 21.10 to install updates only manually.

However, Kubuntu keeps installing updates in the background (I don't actually know which part of the system performs this) and occasionally, it notifies me to reboot my machine.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: systemsettings 4:5.22.5-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-22.22-generic 5.13.19
Uname: Linux 5.13.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu71
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Wed Jan 5 11:10:27 2022
InstallationDate: Installed on 2020-11-26 (404 days ago)
InstallationMedia: Kubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=cs_CZ.UTF-8
 SHELL=/bin/bash
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: systemsettings
UpgradeStatus: Upgraded to impish on 2021-11-16 (49 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.