Hi Santa,
OK thanks. I searched for kde-l10n-* and found about 6 or 7 packages installed, so I removed them. Then, here is what I did:
First, with the kde-frameworks repo disabled, I fully updated the system, and rebooted it. Then, I enabled the kde-frameworks repo and ran d-u. Here is the output:
root@dec-kde5:/etc/apt/sources.list.d# apt-get dist-upgrade -d
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
breeze breeze-cursor-theme breeze-icon-theme frameworkintegration gdb-minimal kactivities kde-cli-tools
kde-cli-tools-data kde-style-breeze kded5 khelpcenter kinit kio-extras kio-extras-data ksysguard-data
ktexteditor-data kwin kwin-data kwin-style-breeze libdbusmenu-qt5 libjs-underscore libkdecorations5
libkf5activities5 libkf5archive5 libkf5attica5 libkf5auth-data libkf5auth5 libkf5baloocore1
libkf5bookmarks-data libkf5bookmarks5 libkf5codecs-data libkf5codecs5 libkf5completion5 libkf5config-data
libkf5configcore5 libkf5configgui5 libkf5configwidgets-data libkf5configwidgets5 libkf5coreaddons5
libkf5crash5 libkf5dbusaddons-data libkf5dbusaddons5 libkf5declarative-data libkf5declarative5
libkf5dnssd-data libkf5dnssd5 libkf5emoticons-data libkf5emoticons5 libkf5globalaccel-data
libkf5globalaccel5 libkf5guiaddons5 libkf5i18n-data libkf5i18n5 libkf5iconthemes-data libkf5iconthemes5
libkf5idletime5 libkf5itemviews-data libkf5itemviews5 libkf5jobwidgets-data libkf5jobwidgets5 libkf5js5
libkf5jsembed-data libkf5jsembed5 libkf5kcmutils-data libkf5kcmutils5 libkf5kdelibs4support5
libkf5khtml-data libkf5khtml5 libkf5kiocore5 libkf5kiofilewidgets5 libkf5kiowidgets5
libkf5networkmanagerqt5 libkf5newstuff-data libkf5newstuff5 libkf5notifications-data libkf5notifications5
libkf5notifyconfig-data libkf5notifyconfig5 libkf5parts-data libkf5parts5 libkf5plasma5
libkf5plasmaquick5 libkf5pty-data libkf5pty5 libkf5runner5 libkf5screen5 libkf5service-bin
libkf5service-data libkf5service5 libkf5solid5 libkf5solid5-data libkf5sonnet5-data libkf5sonnetcore5
libkf5sonnetui5 libkf5su5 libkf5sysguard5 libkf5sysguard5-data libkf5texteditor5 libkf5textwidgets-data
libkf5textwidgets5 libkf5threadweaver5 libkf5wallet5 libkf5webkit5 libkf5widgetsaddons-data
libkf5widgetsaddons5 libkf5windowsystem-data libkf5windowsystem5 libkf5xmlgui-data libkf5xmlgui5
libkf5xmlrpcclientprivate5 libkfontinst5 libkfontinstui5 libksgrd5 libksignalplotter5
libkwalletbackend5-5 libkwin4-effect-builtins1 libkwineffects5 libkwinglutils5 libkwinxrenderutils5
libkworkspace5 libphonon4qt5-4 libplasma-geolocation-interface5 libpolkit-qt5-1-1 libprocesscore5
libprocessui5 libqt5clucene5 libqt5concurrent5 libqt5core5a libqt5dbus5 libqt5designer5
libqt5designercomponents5 libqt5gui5 libqt5help5 libqt5multimedia5 libqt5multimediaquick-p5
libqt5network5 libqt5opengl5 libqt5printsupport5 libqt5qml5 libqt5quick5 libqt5quickwidgets5
libqt5script5 libqt5sql5 libqt5svg5 libqt5webkit5 libqt5widgets5 libqt5x11extras5 libqt5xml5
libtaskmanager5 libweather-ion7 libxcb-icccm4 libxcb-render-util0 libxcb-xkb1 milou oxygen-sounds
plasma-desktop-data plasma-framework plasma-workspace qdbus-qt5 qml-module-org-kde-draganddrop
qml-module-org-kde-kcoreaddons qml-module-org-kde-kquickcontrols qml-module-org-kde-kquickcontrolsaddons
qml-module-org-kde-runnermodel qml-module-org-kde-solid qml-module-qtgraphicaleffects
qml-module-qtmultimedia qml-module-qtquick-controls qml-module-qtquick-dialogs qml-module-qtquick-layouts
qml-module-qtquick-privatewidgets qml-module-qtquick-window2 qml-module-qtquick2
qtdeclarative5-controls-plugin qtdeclarative5-kf5declarative qtdeclarative5-kf5solid
qtdeclarative5-quicklayouts-plugin qttools5-dev-tools systemsettings-data
The following packages will be upgraded:
kde-full kde-plasma-desktop kde-plasma-netbook kde-window-manager kde-workspace kde-workspace-bin
kde-workspace-data kdeadmin kdeedu kdegames kdegraphics kdemultimedia kdenetwork kdeutils khelpcenter4
klipper kmenuedit ksysguard ksysguardd libdbusmenu-qt2 libkactivities-bin libphonon4 phonon
plasma-desktop plasma-nm systemsettings
26 upgraded, 179 newly installed, 0 to remove and 0 not upgraded.
Need to get 89.3 MB of archives.
After this operation, 297 MB of additional disk space will be used.
Do you want to continue? [Y/n]
This looks pretty good, doesn't it? Shall I let it upgrade?