Mystery printer in firefox under Ubuntu 14.04.5

[Robert Heller]

At Thu, 16 Mar 2017 11:40:05 +0000 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> On Wed 15 Mar 2017 at 17:36:18 -0400, Robert Heller wrote:
> 
> > For some unknown reason a "mystery" printer is showing up in FF's selection of
> > printers. This printer does NOT show up in 'lpstat -t'. It is not in
> > /etc/cups/printers.conf. And I know for sure that I uninstalled the (stupid)
> > deamon that finds new random printers (don't need or want that sort of "user
> > friendliness"). Is this a Ubuntu issue or a Firefox issue or a Unity/Gnome
> > issue? I have not seen this on my CentOS machines, ever. It only seems to
> > happen on the diskless Ubuntu machines I set up using DRBL.
> 
> Please post
> 
> 1. The entry for this printer in Firefox's print dialog.

Don't have the exact thing right now -- the machine in question is not powered
up right now and I am not presently at the library. It is something like
"NPI76<more digits>"

> 
> 2. The name of the "(stupid) deamon".

cups-browsed

This daemon is (I guess) meant to be helpful (?) on a laptop that 'roams'
about and it seems to find new printers and/or remove printers that are no
longer available. We don't want / need this on *hard (network) wired*
workstations with a pair of *hard (network) wired* printers.  We don't want 
printers coming and going automagically.

> 
> 3. The outputs of
> 
> 	/usr/sbin/lpinfo -v
> 	lpstat -t
> 	systemctl status avahi-daemon.service


On the Ubuntu VM server (serves the /tftpboot of the kernel, the root and /usr 
file systems to the PXE booting diskless workstations):

ub140464.wendellfreelibrary.org% /usr/sbin/lpinfo -v
network ipp
network ipps
network http
network lpd
network https
network socket
network ipp14
direct hp
serial serial:/dev/ttyS0?baud=115200
network smb
direct hpfax
network dnssd://hp%20LaserJet%204200%20(0001E67659FE)._pdl-datastream._tcp.local/
ub140464.wendellfreelibrary.org% lpstat -t
scheduler is running
system default destination: BrotherColorLaser
device for BlackandWhiteLaserjet: ipp://192.168.1.251:631/printers/BlackandWhiteLaserjet
device for BrotherColorLaser: socket://192.168.1.252
BlackandWhiteLaserjet accepting requests since Sat 27 Sep 2014 05:47:52 PM EDT
BrotherColorLaser accepting requests since Fri 05 Dec 2014 04:03:05 PM EST
printer BlackandWhiteLaserjet is idle.  enabled since Sat 27 Sep 2014 05:47:52 PM EDT
printer BrotherColorLaser is idle.  enabled since Fri 05 Dec 2014 04:03:05 PM EST

There is no systemctl.  The machines are not running systemd, they are Ubuntu 
14.04.5 and using upstart.

I will get the exact info from one of the workstations later today.

> 
> 4. The makes/models of printers on the network.

HP LaserJet 4200
Brother MFC-9970CDW

> 
> We assume you have a wireless-enabled network.
> 

There is wireless, but all of the workstations are hard wired and none have 
wireless.  Both printers are hard wired.  One printer does not have wireless 
(the *old* HP B&W LaserJet) and the other has the wireless turned off.

The Ubuntu "server" is running as a VM on a CentOS 6 machine.  The CentOS 6 is 
the main file server (/home) and is also the DNS, DHCP, and LDAP server.  It 
is also the network print server (or at least tries to be).  Both the Ubuntu 
"server" and the CentOS 6 machine provide tftp and nfs services.


-- 
Robert Heller             -- 978-544-6933
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