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Ubuntu 14.04 does not allow changing default calculator?

I created a custom shortcut in Keyboard->Shortcuts and set it opens qalculator app. Then I assigned to it the keyboard Calculator key. Ubuntu asked me if I want to replace the original app and ...
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A cli calculator who recognize wrong math syntax?

I'm looking for a way to do quick calculations in the terminal (using utilities available in Ubuntu minimal) and get accurate fail errors when the math syntax is incorrect, eg: cli-calculator "foo+bar"...
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Getting an error while installing calculator lens

This is the error I get every time I try installing calculator lens yash@yash-desktop:~$ sudo add-apt-repository ppa:scopes-packagers/ppa [sudo] password for yash: Sorry, try again. [sudo] password ...
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Daily update of currency rate

I'm using gnome-calculator 3.10.3 (A.K.A. gcalctool) on Ubuntu 14.04 LTS. Is there any way how to force the system to update currency rates on daily basis? I have found this topics, but my version (...