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
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