*** On TERRA netbook 1450 II the touchpad was working normal during installation and after installation of updates. The following day the touchpad isn't working at all. in the system settings no touchpad is found. *** SOFTWARE/OS VERSIONS Linux/KDE Plasma:
Thank you for the bug report! However Plasma 6.3.6 no longer receives updates or maintenance from KDE; active versions are 6.4 or newer. Please upgrade to an active version as soon as your distribution makes it available to you. Plasma is a fast-moving project, and bugs in one version are often fixed in the next one. If you need help with Plasma 6.3.6, please contact your distribution, who bears the responsibility of providing help for older releases that are no longer receiving updates from KDE. If you can reproduce the issue after upgrading to an active version, feel free to re-open this bug report.
> in the system settings no touchpad is found This suggests a driver or hardware issue. If it doesn't show up there, there isn't anything KDE can do about it. I'd recommend you get in touch with the device manufacturer about this issue.