How to show comma separation in numbers on Ubuntu's calculator?
Solution 1:
ubuntu 14.04 / calculator 3.10.3 && calculator 3.18.3 - ubuntu 16.04
The solution took me a few minutes too long to find given the simplicity and obviousness of it so here it is in case anybody else overlooks it like I did and will again next time I reinstall Ubuntu.
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(calculator 3.10.3 - ubuntu 14.04) click Edit
(calculator 3.18.3 - ubuntu 16.04) click Calculator
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click Preferences
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check Show thousands separators
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click Close
no reboot needed
Bonus Tip - The menus for Ubuntu software programs are not intuitive, especially when the app is not full screen (like the calculator app). To reveal the menu, hover your cursor at the top of the screen and it will show itself. (thanks to Raymond)