I can also confirm this. The problem only affects applications based on kdelibs4, KDE 5 applications properly accept single clicks.
There are upstream bugs concerning this issue, but Plasma 5.2 should have fixed it: https://bugs.kde.org/show_bug.cgi?id=343418 https://bugs.kde.org/show_bug.cgi?id=346946 So apparently it's a Kubuntu-specific issue? Or the assumption stated in https://bugs.kde.org/show_bug.cgi?id=346946#c3 is wrong. ** Bug watch added: KDE Bug Tracking System #343418 https://bugs.kde.org/show_bug.cgi?id=343418 ** Bug watch added: KDE Bug Tracking System #346946 https://bugs.kde.org/show_bug.cgi?id=346946 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1451564 Title: Single-click not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kde-baseapps/+bug/1451564/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs