Set the default printer
If you have more than one printer available, you can select which will be your default printer. You may want to pick the printer you use most often.
You need administrative privileges on the system to set the default printer.
Open the Activities overview and start typing Printers.
Click Printers.
Select your desired default printer from the list of available printers.
Press Unlock in the top right corner and type in your password when prompted.
Select the Default printer checkbox.
When you print in an application, the default printer is automatically used, unless you choose a different printer.