printing on remote printer from GTK applications fails using duplex

[AZ]

Steps to reproduce:

1. add remote ipp printer (remote is running ubuntu cups) using system-config-printer -> shows printer type "remote printer", printers setting in system-config-printer shows duplex, paper and other options from remote ppd, there is no local ppd in /etc/cups/ppd/ for this printer and no MakeModel in printers.conf.
2. try to print from firefox -> Duplex, Paper Type and other options are greyed out and shown as "not available"

Workaround:
1. copy ppd from remote cups server, though this may not always work (filters not available locally or remote cups not accepted binary blob already processed by cupsFilter)
2. use generic ipp profile (does not support all target features)
3. use driverless to generate ppd (may not catch all target features)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: cups-filters 1.20.2-0ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
Uname: Linux 4.15.0-42-generic i686
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: i386
Date: Sun Dec 16 13:36:17 2018
InstallationDate: Installed on 2015-09-14 (1189 days ago)
InstallationMedia: Lubuntu 14.04.3 LTS "Trusty Tahr" - Beta i386 (20150805)
Lpstat:
 device for HLL2300D: ipp://172.16.1.20:631/printers/HLL2300D
 device for Kyocera-Mita-FS-1020D: socket://172.16.1.21
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 006: ID 80ee:0021 VirtualBox USB Tablet
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: innotek GmbH VirtualBox
Papersize: a4
PpdFiles:
 Kyocera-Mita-FS-1020D: Kyocera Mita FS-1020D
 HLL2300D: Brother HL-L2300D for CUPS (remote)
ProcEnviron:
 LANGUAGE=de_DE
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-42-generic root=UUID=c34300f7-d295-40ce-8c33-586987f5f41f ro quiet splash
SourcePackage: cups-filters
UpgradeStatus: Upgraded to bionic on 2018-09-09 (97 days ago)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
dmi.product.family: Virtual Machine
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH