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This question already has an answer here:

I'd like to use advance mode and programming mode in calculator. but it is not showing mode option button in 16.04 ubuntu. How to enable the calculator mode button.

marked as duplicate by Anwar, Zanna, edwinksl, Eric Carvalho, TheWanderer Nov 9 '16 at 0:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Are you using Unity or GNOME3? – Anwar Nov 7 '16 at 7:43
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As of unity launched, Ubuntu used the Global menu feature that places the menu bar for each application on the bar at the top of the screen. So, if you wish to change anything for an application, you will need to hover over the top task bar while focusing on the application.

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Otherwise, there are few command you can use for changing Calculator mode without accessing this hidden menu.

Basic mode :

gsettings set org.gnome.calculator button-mode basic; gnome-calculator

Advanced mode :

gsettings set org.gnome.calculator button-mode advanced; gnome-calculator

Financial mode :

gsettings set org.gnome.calculator button-mode financial; gnome-calculator

Programming mode :

gsettings set org.gnome.calculator button-mode programming; gnome-calculator

Keyboard mode :

gsettings set org.gnome.calculator button-mode keyboard; gnome-calculator

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