Dell S3845cdn User Manual page 58

Uninstalling the Printer Driver
1 Click Dash Home, and enter terminal in the Search text box.
2 Click Terminal in the Applications category of the search results.
3 Type the following command in the terminal window to delete the print queue.
sudo /usr/sbin/lpadmin -x (Type the print queue name)
(Type the administrator password)
4 Repeat the command above for all queues for the same model.
5 Type the following command in the terminal window.
sudo dpkg -r dell-color-mfp-s3845cdn
(Type the administrator password)
The printer driver is uninstalled.
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| Installing Printer Drivers on Linux Computers (CUPS)