I need to know when the "Caps Lock " key is turned on.
Does Ubuntu has a visual indicator to show me when the key "Caps Lock" is on?
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I needed a visual indicator on my screen since my laptop didn't have any such indicator. My solution might address your question.
1) add the program indicator-keylock by entering the following command in a terminal
sudo apt install indicator-keylock
enter your password when prompted - no text will be displayed as you type your password
2) add this program to your computer's start up programs.