kubuntu 20 lts notofications widgets not work

http://asd.ft.lv/Screenshot_20200725_224001.png

What is output of commands:
apt-cache policy plasma-workspace
busctl --user status org.freedesktop.Notifications
grep -i org.kde.plasma.notifications ~/.xsession-errors

feika@feika-hp:~$ apt-cache policy plasma-workspace
plasma-workspace:
  Установлен: 4:5.18.5-0ubuntu0.1
  Кандидат: 4:5.18.5-0ubuntu0.1
  Таблица версий:
 *** 4:5.18.5-0ubuntu0.1 500
        500 http://lv.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages
        100 /var/lib/dpkg/status
     4:5.18.4.1-0ubuntu1 500
        500 http://lv.archive.ubuntu.com/ubuntu focal/universe amd64 Packages

eika@feika-hp:~$ busctl --user status org.freedesktop.Notifications
Failed to get credentials: No such device or address

feika@feika-hp:~$ grep -i org.kde.plasma.notifications ~/.xsession-errors
feika@feika-hp:~$

You removed Notifications widget from plasma panel? Try add it back:
https://docs.kde.org/stable5/en/kde-workspace/plasma-desktop/add-applets.html

'System Tray' may be correct name for that widget

thank you very much I came in
https://docs.kde.org/stable5/en/kde-workspace/plasma-desktop/add-applets.html
in general, I didn't do anything but after that he earned, maybe I downloaded it myself?

thank you all earned