When setting up a CUPS printer manually via Settings, USB is currently an option available under the Protocol dropdown. We should remove this option as we are enabling USB connectivity for printers (which should auto-detect and configure).
As a note - By removing this option, we will no longer have the ability to configure a printer via USB manually in case an error occurs with the auto-configuration process. This should be an edge case, but we will monitor to see if we need to add support to handle this.
Comment 1 by bugdroid1@chromium.org
, Mar 20 2017