Mystery printer in firefox under Ubuntu 14.04.5

[Robert Heller]

At Fri, 17 Mar 2017 12:08:24 -0400 (EDT) "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> At Fri, 17 Mar 2017 12:37:38 +0000 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:
> 
> > 
> > On Fri 17 Mar 2017 at 08:20:19 -0400, Robert Heller wrote:
> > 
> > > At Fri, 17 Mar 2017 08:22:01 +0000 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:
> > > 
> > > > 
> > > > On Thu 16 Mar 2017 at 21:36:19 -0400, Robert Heller wrote:
> > > > 
> > > > > At Thu, 16 Mar 2017 23:38:17 +0000 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:
> > > > > 
> > > > > > Stop avahi-daemon on the Centos server or on a workstation.
> > > > > > 
> > > > > > What did avahi-browse tell you about the culprit? You could post that
> > > > > > snippet from the output.
> > > > > 
> > > > > Well, the Centos's avahi-daemon is not reporting the printer, but the 
> > > > > avahi-daemon on Ubuntu server (and the Ubuntu workstations are).  If the avahi 
> > > > > daemon is not running, will that cause other problems?
> > > > 
> > > > Dunno. You'll lose mDNS/DNS-SD resolution on the network. 'apt-cache
> > > > rdepends avahi-daemon' might help you decide.
> > > 
> > > Well I stopped avahi-daemon on the CentOS machine.  The CentOS machine is 
> > > itself running BIND (it is the local DNS server) and does not use apt.  I 
> > > stopped avahi-daemon on the CentOS machine.  The Ubuntu server is no longer 
> > > reporting the HP printer in lpinfo.  Hopefully the workstations will stop 
> > > reporting it too.  I don't run apt on the workstations -- they get updated 
> > > when the Ubuntu server gets updated (their root and /usr file systems are 
> > > shared off the Ubuntu server).
> > > 
> > > > 
> > > > You could rejig the setup and use cups-browsed on the workstations, of
> > > > course, and activate AirPrint on the colour printer. Any i-device users
> > > > might thank you for this.
> > > 
> > > We really don't want i-device users sending lots of random stuff to the color
> > > printer.
> > 
> > Understandable.
> > 
> > If all the printing from a workstation is done from GTK apps (no command
> > line printing; no QT apps ; no libreoffice) you could stop (or remove)
> > cups and rely on Bonjour broadcasts.
> 
> People are using libreoffice, so that needs to work.  There is another 
> printer, a receipts printer connected by USB to one workstation, which in turn 
> exports it to another workstation.  This printer handled with CUPS and is only 
> used by these two workstations and is not visible or accessable by any other 
> workstations.  These two workstations are involved with library circulation.

OK, after a bit of groveling about at the library this afternoon I went and
purged avahi-daemon completely off the Ubuntu machines. I don't believe I need
the Multicast DNS -- the CentOS 6 server is running Bind 9 and there is no
dynamic DNS going on (if we add or remove a machine *I* will manually update
the DNS data and reload named). And for printers I will *manually* update
cups's conf files. Both of these things will be very rare.

> 
> > 
> > Or there is this;
> > 
> > https://launchpad.net/~roman-shipovskij/+archive/ubuntu/gtk+3.0-withoutavahiprinters
> > 
> 

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