You have a PCL5 or PostScript driver installed instead of the host-based driver. Fix: Delete the printer object. Reinstall using the exact "HP LaserJet P1006" driver, not a generic HP LaserJet driver.
The HP LaserJet P1006 remains a workhorse for basic black-and-white text printing. However, its "Host-Based" architecture makes it a legacy device that requires specific driver management. hp laserjet p1006 driver