Parley 2.1.0 in Lubuntu 17.04 and 17.10 In Lubuntu 17.04 and 17.10 it is no longer possible to count a 'wrong' answer as correct. The icons to switch right/wrong simply don't appear any more. This renders the practice mode essentially useless. (Previously in Lubuntu 16.04, practice mode worked normally, but Parley would crash if the Editor was launched).
See the update and workaround here: https://bugs.kde.org/show_bug.cgi?id=420790 (I now see that I've filed reports for this bug several times in the past few years).
*** This bug has been marked as a duplicate of bug 420790 ***