If you’re using intellij under Ubuntu you probably noticed the keyboard stops working sometimes just in the IDE.
This is very anoying and there is an open issue: https://youtrack.jetbrains.com/issue/IDEA-78860
If you want to enable again the keyboard execute this command on any terminal:
ibus-daemon -rd
This seems to work in versions 14.04 and 14.10.
Source: http://askubuntu.com/questions/501907/keyboard-locks-in-intellij-idea-on-ubuntu-14-04
Yet Another Blog 
I’ve had this issue several times, your solution works on Ubuntu 20.04, thanks a lot.
Comment by Yonah — June 11, 2020 @ 8:52 am
Still broken in Ubuntu 20.04, Pycharm versión 2020.1.1 and this still fixes it
Comment by ANewMan — August 29, 2020 @ 6:14 am
`ibus-daemon -rd` doesn’t seem to help anymore, Fedora 33.
Comment by serg — March 1, 2021 @ 8:17 pm
Reblogged this on sagiserg.
Comment by Sergey Sh — March 1, 2021 @ 8:18 pm