Seems to be bug https://bugs.kde.org/show_bug.cgi?id=343803.
The bug seems to be triggered by the combination of Qt, plasma 5 *and*
the legacy nvidia 340 driver.
It is unfortunate that KDE people are marking this as "resolve" when
clearly it is not.
It is also unfortunate that they mark it as
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: konsole (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1634565
