Based on the above message I just installed
   qtgraphicaleffects5-5.9.4-1.mga6.x86_64.rpm

Now systemsettings window opens.

One missing dependency, so far...

	[bash 4.3]$ systemsettings5
	kf5.kcoreaddons.desktopparser: Unable to find service type for service "KPackage/GenericQML" listed in "/usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar//metadata.desktop"
	KActivities: Database connection:  "kactivities_db_resources_140362909734912_readonly" 
		query_only:          QVariant(qlonglong, 1) 
		journal_mode:        QVariant(QString, "wal") 
		wal_autocheckpoint:  QVariant(qlonglong, 100) 
		synchronous:         QVariant(qlonglong, 0)
	Nothing to load - the client id is empty
	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString

	Σφάλμα κατάτμησης (segmentation fault) (core dumped)

Summary: systemsettings crashes (segmentation fault) => Systemsettings crashes (segmentation fault). Missing dependency "qtgraphicaleffects5" .

(In reply to nikos papadopoulos from comment #2)
> 	[bash 4.3]$ systemsettings5
> 	kf5.kcoreaddons.desktopparser: Unable to find service type for service
> "KPackage/GenericQML" listed in
> "/usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar//metadata.
> desktop"
> 	KActivities: Database connection: 
> "kactivities_db_resources_140362909734912_readonly" 
> 		query_only:          QVariant(qlonglong, 1) 
> 		journal_mode:        QVariant(QString, "wal") 
> 		wal_autocheckpoint:  QVariant(qlonglong, 100) 
> 		synchronous:         QVariant(qlonglong, 0)
> 	Nothing to load - the client id is empty
> 	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/
> contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
> 	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/
> contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
> 	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/
> contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
> 	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/
> contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
> 	file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/
> contents/ui/introPage.qml:90:27: Unable to assign [undefined] to QString
> 
> 	Σφάλμα κατάτμησης (segmentation fault) (core dumped)

Please ignore the above message.
It probably belongs to another bug.

Fixed in Cauldron!

CC: (none) => geiger.david68210

Mageia 6 changed to end-of-life (EOL) status on 2019-09-30. It is no longer 
maintained, which means that it will not receive any further security or bug 
fix updates.

Package Maintainer: If you wish for this bug to remain open because you plan 
to fix it in a currently maintained version, simply change the 'version' to 
a later Mageia version.

Bug Reporter: Thank you for reporting this issue and we are sorry that we 
weren't able to fix it before Mageia 6's end of life. If you are able to 
reproduce it against a later version of Mageia, you are encouraged to click 
on "Version" and change it against that version of Mageia.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events. Often a more recent
Mageia release includes newer upstream software that fixes bugs or makes them
obsolete.

If you would like to help fixing bugs in the future, don't hesitate to join the
packager team via our mentoring program [1] or join the teams that fit you 
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[1] https://wiki.mageia.org/en/Becoming_a_Mageia_Packager
[2] http://www.mageia.org/contribute/

Best regards,
Aurélien
Bugsquad Team

Resolution: (none) => OLD
Status: NEW => RESOLVED
CC: (none) => ouaurelien