SUMMARY STEPS TO REPRODUCE 1. sdo apt install ibus-17n 2. 3. OBSERVED RESULT not typing my password EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
sudo (I presume you meant that, I don't know of a sdo command) is not part of kde so marking upstream. Could it be that you'd authenticated to sudo within the previous 15 minutes (sudo caches credentials for a while so you don't have to keep entering your password)
*** Bug 440700 has been marked as a duplicate of this bug. ***
By default, sudo does not display anything when you type, but it can be configured to do so ("pwfeedback"). As Paul indicates, this is neither a KDE nor a Kubuntu issue.