KNotes application was carelessly deleted by the recent update (has gone from existing/installed apps).
And I had my text notes there.
What if I installed some kde password manager and Manjaro would have silently delete it (along with all critical data) on some update 
That’s a bad sign.
$ inxi -S
System:
Host: roman-pc Kernel: 6.9.3-3-MANJARO arch: x86_64 bits: 64
Desktop: KDE Plasma v: 6.0.5 Distro: Manjaro Linux
When a package is removed, any user files aren’t deleted. So your text notes will still be there.
I can only guess that that package may have been removed because its developer hasn’t bothered updating it to work with Plasma 6, but that is only a guess.
Plasma 6 has brought a lot of issues.
I do not believe that. knotes has been ported to qt6 and should therefore have been upgraded. If it was removed, then that can only have been the result of something you did.
Either way, you can reinstall it from the repository. Your notes files will still be there in your home directory. This is not Microsoft Windows, with a Registry that covers both system-wide settings and user settings.
As above: the applications and their data are stored in separate locations on your drive. Applications go under the system-wide directory hierarchy — /usr, and sometimes /opt — and data goes under the users’ individual home directories.
As for password managers, Plasma has its own password manager, called kwallet, and it is a dependency of many things, so it’s always installed. But even then still, see above: your data is always separate.
Please stop using Microsoft logic. Windows was never designed as a multi-user operating system — it wasn’t even an operating system to begin with — while GNU/Linux is a UNIX-style multi-user operating system, and was designed as such from the ground up.
I don’t like Windows at all, but see enough issues in Manjaro.
It is telling you what the problem is. You don’t have akonadi running. I’ll leave it to you to figure out why that is the case.
But your mind is expecting that GNU/Linux would behave in the same manner as Microsoft Windows.
Sure, from people who cannot be bothered paying attention to the Announcements threads. 
Will drop this off here too, then… 
Major new versions of KDE (and I’m sure every other desktop environment) have always ended up with incompatibilities vis-a-vis the previous version. If you want to wait until every (or at least, most) thing has been tidied up you need to use a distro with a slower update cycle, such as Debian. By using a rolling distro such as Manjaro you have committed yourself to getting bleeding-edge packages, along with any issues that may bring. There’s really no point in whingeing about it.
I don’t actually use kNotes, but I’m guessing your saved notes will still be available in whatever location you chose as the default.
I’ll take this opportunity to suggest Obsidian (which I also use) as a possible alternative. One can create and save notes as markdown documents; always accessible as text, if needed.
It’s installable directly from the Manjaro repositories:
sudo pacman -S obsidian
Cheers.
After I installed it an hour ago, even with Use folder by default setting it doesn’t recover my last note (text).
I’m saying the data should still be there. You would of course need to navigate to the location (wherever it was) using Dolphin.
If you chose the default location when you first used kNotes, then your notes are likely still there - only, not through kNotes, if it isn’t currently working.
I just tried installing kNotes; it failed to launch at all. Beyond that, I have nothing useful to add.
Cheers.
wow, bring here more of you friends so you could smash and destroy me remotely with your unsurpassed authority.
that seems to justify the topic )
As far as I know, it relies on a database (notes are not stored in plain text) - access to which is provided through akonadi, a service which is, as per your screenshot, not operational at the moment.
I guess you’ll need to fix that first.
No - a sync does not remove packages.
It may happen a package is removed from the repo - usually it ends in AUR - where someone may pick it up and continue maintaining as a custom package.
But new snaps and the following sync by an enduser never removes active packages - not even if they go unmaintained - it may alter the function of an active package - never remove it.
And KNotes is still a part of Plasma,
I’ve fixed that, but it doesn’t recover my last note.
Can’t help with that - I’d speculate that the update caused the database connection to fail without you noticing it, and thus the note wasn’t saved.
I guess there is nothing you can do to recover it.
As I mentioned, I don’t use kNotes.
However, I opened it once or twice in the past (not necessarily on Manjaro) and seem to recall it simply opened ready for a first note.
I have the feeling that something else is in play - perhaps an incompatibility of one of the dependencies; or even a damaged database; but these are guesses, at best.
I’d agree that could also be plausible; especially if you can still access the previous notes.
My preference is to always save notes as accessible text or markdown files; which is why I like Obsidian (and similar), as my data is never dependent on any particular app or database system.
Logs or it didn’t happen.
Closing. Blaming others and making false accusations is not acceptable.