Public bug reported:

On a fresh install of Kubuntu 17.04 I cannot add a network printer though the 
HPLIP Toolbox. I get an error message that says "HPLIP cannot detect printers 
in your network.
This may be due to existing firewall settings blocking the required ports. When 
you are in a trusted network environment, you may open the ports for network 
services like mdns and slp in the firewall. For detailed steps follow the link. 
http://hplipopensource.com/node/374";

However snmpwalk finds the printer perfectly fine
$ snmpwalk -Os -c public -v 1 192.168.1.21 1.3.6.1.4.1.11.2.3.9.1.1.7.0 
iso.3.6.1.4.1.11.2.3.9.1.1.7.0 = STRING: 
"MFG:Hewlett-Packard;CMD:PJL,PML,PCLXL,URP,PCL,PDF,POSTSCRIPT;MDL:HP LaserJet 
200 colorMFP M276nw;CLS:PRINTER;DES:Hewlett-Packard LaserJet 200 colorMFP 
M276nw;MEM:MEM=230MB;COMMENT:RES=600x8;LEDMDIS:USB#ff#04#01;CID:HPLJPDLV1;"

Other systems that were upgraded to 17.04 can still access and detect
the printer.

What I expect to happen:
1. Open HPLIP Toolbox
2. Add a network printer
3. Printer is detected

What happened instead
1. Open HPLIP Toolbox
2. Add a network printer
3. No printers found

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: hplip-gui 3.16.11+repack0-2
ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
Uname: Linux 4.10.0-22-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.1
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Jun 14 11:23:50 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-06-09 (4 days ago)
InstallationMedia: Kubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
Lpstat:
 device for Hewlett-Packard-HP-LaserJet-P1505: 
implicitclass:Hewlett-Packard-HP-LaserJet-P1505
 device for HP-LaserJet-200-colorMFP-M276nw: ipp://NPI62B4B3.local:631/ipp/print
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 8087:0aa7 Intel Corp. 
 Bus 001 Device 002: ID 1bcf:2c87 Sunplus Innovation Technology Inc. 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP Pavilion Notebook
PackageArchitecture: all
Papersize: letter
PpdFiles:
 Error: command ['fgrep', '-H', '*NickName', 
'/etc/cups/ppd/HP-LaserJet-200-colorMFP-M276nw.ppd', 
'/etc/cups/ppd/Hewlett-Packard-HP-LaserJet-P1505.ppd'] failed with exit code 2: 
grep: /etc/cups/ppd/HP-LaserJet-200-colorMFP-M276nw.ppd: Permission denied
 grep: /etc/cups/ppd/Hewlett-Packard-HP-LaserJet-P1505.ppd: Permission denied
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-22-generic.efi.signed 
root=UUID=e56bcb4e-c73e-4581-9f09-4ef3fe063e74 ro quiet splash vt.handoff=7
SourcePackage: hplip
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/07/2017
dmi.bios.vendor: Insyde
dmi.bios.version: F.36
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 8215
dmi.board.vendor: HP
dmi.board.version: 83.15
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnInsyde:bvrF.36:bd04/07/2017:svnHP:pnHPPavilionNotebook:pvrType1ProductConfigId:rvnHP:rn8215:rvr83.15:cvnHP:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion Notebook
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP

** Affects: hplip (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

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https://bugs.launchpad.net/bugs/1697958

Title:
  HPLIP cannot detect printers in your network

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