/usr/share/kwin/effects/ is in kwin-data 4:5.5.5-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kwin/effects/desktopgrid/
/usr/share/kwin/effects/desktopgrid/main.qml
/usr/share/kwin/effects/kwin4_effect_dialogparent/
/usr/share/kwin/effects/kwin4_effect_dialogparent/contents/
/usr/share/kwin/effects/kwin4_effect_dialogparent/contents/code/
/usr/share/kwin/effects/kwin4_effect_dialogparent/contents/code/main.js
/usr/share/kwin/effects/kwin4_effect_dialogparent/metadata.desktop
/usr/share/kwin/effects/kwin4_effect_eyeonscreen/
/usr/share/kwin/effects/kwin4_effect_eyeonscreen/contents/
/usr/share/kwin/effects/kwin4_effect_eyeonscreen/contents/code/
/usr/share/kwin/effects/kwin4_effect_eyeonscreen/contents/code/main.js
/usr/share/kwin/effects/kwin4_effect_eyeonscreen/metadata.desktop
/usr/share/kwin/effects/kwin4_effect_fade/
/usr/share/kwin/effects/kwin4_effect_fade/contents/
/usr/share/kwin/effects/kwin4_effect_fade/contents/code/
/usr/share/kwin/effects/kwin4_effect_fade/contents/code/main.js
/usr/share/kwin/effects/kwin4_effect_fade/contents/config/
/usr/share/kwin/effects/kwin4_effect_fade/contents/config/main.xml
/usr/share/kwin/effects/kwin4_effect_fade/metadata.desktop
/usr/share/kwin/effects/kwin4_effect_fadedesktop/
/usr/share/kwin/effects/kwin4_effect_fadedesktop/contents/
/usr/share/kwin/effects/kwin4_effect_fadedesktop/contents/code/
/usr/share/kwin/effects/kwin4_effect_fadedesktop/contents/code/main.js
/usr/share/kwin/effects/kwin4_effect_fadedesktop/metadata.desktop
/usr/share/kwin/effects/kwin4_effect_login/
/usr/share/kwin/effects/kwin4_effect_login/contents/
/usr/share/kwin/effects/kwin4_effect_login/contents/code/
/usr/share/kwin/effects/kwin4_effect_login/contents/code/main.js
/usr/share/kwin/effects/kwin4_effect_login/contents/config/
/usr/share/kwin/effects/kwin4_effect_login/contents/config/main.xml
/usr/share/kwin/effects/kwin4_effect_login/contents/ui/
/usr/share/kwin/effects/kwin4_effect_login/contents/ui/config.ui
/usr/share/kwin/effects/kwin4_effect_login/metadata.desktop
/usr/share/kwin/effects/kwin4_effect_maximize/
/usr/share/kwin/effects/kwin4_effect_maximize/contents/
/usr/share/kwin/effects/kwin4_effect_maximize/contents/code/
/usr/share/kwin/effects/kwin4_effect_maximize/contents/code/maximize.js
/usr/share/kwin/effects/kwin4_effect_maximize/metadata.desktop
/usr/share/kwin/effects/kwin4_effect_scalein/
/usr/share/kwin/effects/kwin4_effect_scalein/contents/
/usr/share/kwin/effects/kwin4_effect_scalein/contents/code/
/usr/share/kwin/effects/kwin4_effect_scalein/contents/code/main.js
/usr/share/kwin/effects/kwin4_effect_scalein/metadata.desktop
/usr/share/kwin/effects/kwin4_effect_translucency/
/usr/share/kwin/effects/kwin4_effect_translucency/contents/
/usr/share/kwin/effects/kwin4_effect_translucency/contents/code/
/usr/share/kwin/effects/kwin4_effect_translucency/contents/code/main.js
/usr/share/kwin/effects/kwin4_effect_translucency/contents/config/
/usr/share/kwin/effects/kwin4_effect_translucency/contents/config/main.xml
/usr/share/kwin/effects/kwin4_effect_translucency/contents/ui/
/usr/share/kwin/effects/kwin4_effect_translucency/contents/ui/config.ui
/usr/share/kwin/effects/kwin4_effect_translucency/metadata.desktop
/usr/share/kwin/effects/kwin4_effect_windowaperture/
/usr/share/kwin/effects/kwin4_effect_windowaperture/contents/
/usr/share/kwin/effects/kwin4_effect_windowaperture/contents/code/
/usr/share/kwin/effects/kwin4_effect_windowaperture/contents/code/main.js
/usr/share/kwin/effects/kwin4_effect_windowaperture/metadata.desktop
/usr/share/kwin/effects/presentwindows/
/usr/share/kwin/effects/presentwindows/main.qml