What did you do with the keyboard?!
I found a lot of other problems, because triple combinations keys
doesn't work at all. From the other side, we've got "on-screen keyboard"
which is useless on DESKTOP Linux.
How to return the normal keyboard behavior from KUbunutu 16.04?
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You received this
The same problem with Yakuake:
Shift + Ins works, it makes "paste"
Ctrl + Ins doesn't work. Appeares "5~".
Taking in account, that Yakuake just a wrapper for Konsole, I checked
combinations there and they works, as expected.
Before update from KUbuntu 16.04.4 to 18.04 all works fine.
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You