Canon MP520 Scanner Quick Start for Ubuntu 15.10 Wily
The Linux Ubuntu Tutorial shows you Step-by-Step How to Install the Canon PIXMA MP520 Scanner Driver and Quick Start Scanning on Ubuntu 15.10 Wily Werewolf GNU/Linux Desktop.
Included in the Canon MP520 Installation Tutorial for Ubuntu you find also detailed instructions on How to Get Started with Canon Scanning on Ubuntu.

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Open Terminal Shell emulator window
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands) -
Download Canon MP520 Scanner Linux Driver
Select the Linux 32/64-bit OS from Drop-Down.
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Open a File Manager Window
Go to Home > Downloads -
Double-Click on Scanner Driver.
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Extract into the /tmp Directory.
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Checking/Installing GDebi Package Installer:
which gdebi
If Not there then:
sudo apt-get install gdebi gdebi-core
If Got “User is Not in Sudoers file” then see: How to Enable sudo
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Install the Canon Packages with:
cd /tmp/scangearmp-*-deb
For 32-bit Systems:
sudo gdebi ./*i386.deb
For 64-bit Systems:
sudo gdebi ./*amd64.deb
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Installing Canon Scanner Driver.
cd /tmp/scangearmp-*-deb
sudo ./install.sh
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Get Started Scanning on Ubuntu