The org.kde.ksudoku.desktop file need to be updated to exclude the -caption option as I have been told this function has been deprecated in plasma5. The app fails to launch via the menu/icon in its current state. The following line in src/gui/org.kde.ksudoku.desktop need fixed: Exec=ksudoku %i -caption %c Removing the "%i -caption %c" allows the app to launch without issue.
Forgot to mention, version 1.4 is not available in the Version drop-down. But this bug applies to said version.
-qwindowtitle should be used in place of -caption AFAIK, for Qt5/KF5
Git commit 672b4e39f22f840034a8e66e1311175639bff3e3 by Burkhard Lück. Committed on 11/06/2017 at 09:03. Pushed by lueck into branch 'Applications/17.04'. Fix .desktop: Qt5 apps accept qwindowtitle, not caption M +1 -1 src/gui/org.kde.ksudoku.desktop https://commits.kde.org/ksudoku/672b4e39f22f840034a8e66e1311175639bff3e3
This got committed to the 17.04 branch, which is still KDE4 based. So now launching ksudoku is broken in 17.04.3
Reverted 17.04 branch commit: https://cgit.kde.org/ksudoku.git/commit/?id=15b9c4686b3adcea3d430bfd66716e95039490d0
*** Bug 385792 has been marked as a duplicate of this bug. ***