Screen keyboard magically appeared and won't go away

[Forpli]

Remove virtual keyboard/OSK ... again

Apparently, the unwanted popping up of the virtual keyboard is a recurrent problem in Ubuntu without generic solution. Today, I suddenly had it too, on a desktop computer without anything like a touch screen. Yesterday evening, I received a load of updates and also installed the VLC player. So I cannot tell what caused it. There is an option switch among the accessibility settings, but while this can enable the OSK, it cannot suppress it when it appears for causes only known to itself. It has …