I have an HP inkjet printer connected to an lubuntu laptop with a USB cable, installed under CUPS as "inkjet". I can print with AbiWord OK, and a printer test page prints OK from the printer properties dialog, but if I try to print from the command line with "lpr -Pinkjet", nothing happens. I don't get any error message, and the inkjet print queue shows as empty. lpstat shows the print queue as empty.
I am running Ubuntu 16.04.5 LTS. The printer driver is hp-envy_4510_series-hpijs.ppd.
Any ideas?
* Edit 11 Dec 2018 *
I see some error messages in the CUPS error log:
E [11/Dec/2018:09:08:43 -0500] Unknown directive JobPrivateAccess on line 85 of /etc/cups/cupsd.conf.
E [11/Dec/2018:09:08:43 -0500] Unknown directive JobPrivateValues on line 86 of /etc/cups/cupsd.conf.
E [11/Dec/2018:09:08:43 -0500] Unknown directive SubscriptionPrivateAccess on line 87 of /etc/cups/cupsd.conf.
E [11/Dec/2018:09:08:43 -0500] Unknown directive SubscriptionPrivateValues on line 88 of /etc/cups/cupsd.conf.
W [11/Dec/2018:09:08:48 -0500] CreateProfile failed: org.freedesktop.DBus.Error.ServiceUnknown:The name org.freedesktop.ColorManager was not provided by any .service files
W [11/Dec/2018:09:08:48 -0500] CreateProfile failed: org.freedesktop.DBus.Error.ServiceUnknown:The name org.freedesktop.ColorManager was not provided by any .service files
W [11/Dec/2018:09:08:48 -0500] CreateDevice failed: org.freedesktop.DBus.Error.ServiceUnknown:The name org.freedesktop.ColorManager was not provided by any .service files
I am too ignorant of CUPS to know what to do about them or to judge their severity, so I would appreciate any advice.