Проверил, как работает Simply обновленный до Сизифа и дистрибутив Альт Образование с дефолтными установками. Проблема одна и та же. Лог с "Образования".
QXcbConnection: XCB error: 8 (BadMatch), sequence: 579, resource id: 73400333, major code: 155 (Unknown), minor code: 11
kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp"
Recreating ksycoca file ("/home/dmytro/.cache/ksycoca5_ru_eHL5F78IIbOsHsNM6Npb634bT94=", version 303)
Menu "applications-menueditor.menu" not found.
Menu "xfce-applications-menueditor.menu" not found.
Menu "applications-menueditor.menu" not found.
Menu "xfce-applications-menueditor.menu" not found.
The desktop file "/usr/share/slinux-style/applications/remmina.desktop" references the action "Profile" but doesn't define it
The desktop file "/usr/share/slinux-style/applications/remmina.desktop" references the action "Tray" but doesn't define it
Saving
KServiceTypeTrader: serviceType "ThumbCreator" not found
KServiceTypeTrader: serviceType "ThumbCreator" not found
KServiceTypeTrader: serviceType "ThumbCreator" not found
KServiceTypeTrader: serviceType "ThumbCreator" not found
"Error reading audio thumbnail"
org.kde.knotifications: Audio notification requested, but sound file from notifyrc file was not found, aborting audio notification
//////////////////// DISCARD AUIIO THUMBNS
2 из приведенных здесь ошибок явно являются следствием отсутствия зависимостей, т.к. отсутствуют после установки kde5-small, а именно
QXcbConnection: XCB error: 8 (BadMatch), sequence: 579, resource id: 73400333, major code: 155 (Unknown), minor code: 11
KServiceTypeTrader: serviceType "ThumbCreator" not found
Надо выяснять и зависимости дописывать.