Previously, using Ubuntu 16, I pressed Alt+Shift to switch the language, let go of the Alt key, left my finger on the Shift button, and was then able to enter a capital letter.
Now, in Ubuntu 18.04, after using Alt+Shift and releasing the Alt key, lower-case letters continue to be entered, even though the Shift key is being pressed. I have to press it again to enter a capital letter.
I find this terribly inconvenient and very uncomfortable. Does anyone know how to fix this?