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Let's modify the printer using CUPS on the webpage instead of Printers & Scanners.
Hoping it's not too technical.
Enter the localhost in Safari, up the top click Administration. Under Printers click Manage Printers.
Under Queue Name will be a list of all current attached printers. Select the printer giving you issues.

Under the Administration tab, select "Modify Printer".

Make SURE the "USB" is highlighted only. Click continue.
Next screen:

The only tab I changed here when I did it was the location to state Mac mini. Click continue.
Next screen:

Make sue you select the driver that states BOTH "Canon .... & Gutenprint ..." NOT Gutenprint on it's own - make sense?
Click continue:
NOTE: The refresh takes about 6 - 10 seconds, don't navigate away! You should have the printer and the following wording "(Idle, Accepting Jobs, Not Shared)"...