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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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How to connect to a Casio fx-9750GII calculator

I've got a Casio fx-9750GII calculator, wich has a USB Conection. When I conect it to my computer the system does not mount it as a storage device. When I run lsusb this is the return: ...
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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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Is there a subtotaling feature hidden in the Calculate program?

Is there a subtotaling function hidden in the Calculate program? Supposedly there is a facility for assigning values to variables, which would provide that functionality, but I can't find that ...