Public bug reported: Please backport the fix of this Debian bug to Xenial.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=832637 To quote from there: "The problem is most probably caused by inconsistency in how cups-browsed accesses the local CUPS daemon, for some accesses it uses the domain socket (which made it mostly well working in your case) and at other places, especially also during shutdown, it accesses localhost:631 (this is why it hangs on shutdown), independent of configuration." It is fixed in Debian's cups-filters/1.11.4-1. This is NOT a duplicate to #1579905 as is noted in it's comments. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: cups-browsed 1.8.3-2ubuntu3.1 ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21 Uname: Linux 4.4.0-45-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 Date: Fri Oct 28 13:05:19 2016 InstallationDate: Installed on 2016-09-12 (45 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) Lpstat: Error: command ['lpstat', '-v'] failed with exit code 1: lpstat: No destinations added. Lsusb: Bus 002 Device 003: ID 0a5c:5801 Broadcom Corp. BCM5880 Secure Applications Processor with fingerprint swipe sensor Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. Latitude E6320 Papersize: a4 ProcEnviron: LANGUAGE=fi TERM=xterm PATH=(custom, no user) LANG=fi_FI.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-45-generic.efi.signed root=UUID=0b75be02-897e-4a0b-9ff6-441512bb7493 ro SourcePackage: cups-filters UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/14/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A19 dmi.board.name: 05VMY6 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA19:bd11/14/2013:svnDellInc.:pnLatitudeE6320:pvr01:rvnDellInc.:rn05VMY6:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E6320 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. ** Affects: cups-filters (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to cups-filters in Ubuntu. https://bugs.launchpad.net/bugs/1637461 Title: Backport fix of Debian #832637 to xenial, cups-browsed delays shutdown by connecting to localhost:631 while listening only to domain socket Status in cups-filters package in Ubuntu: New Bug description: Please backport the fix of this Debian bug to Xenial. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=832637 To quote from there: "The problem is most probably caused by inconsistency in how cups-browsed accesses the local CUPS daemon, for some accesses it uses the domain socket (which made it mostly well working in your case) and at other places, especially also during shutdown, it accesses localhost:631 (this is why it hangs on shutdown), independent of configuration." It is fixed in Debian's cups-filters/1.11.4-1. This is NOT a duplicate to #1579905 as is noted in it's comments. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: cups-browsed 1.8.3-2ubuntu3.1 ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21 Uname: Linux 4.4.0-45-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 Date: Fri Oct 28 13:05:19 2016 InstallationDate: Installed on 2016-09-12 (45 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) Lpstat: Error: command ['lpstat', '-v'] failed with exit code 1: lpstat: No destinations added. Lsusb: Bus 002 Device 003: ID 0a5c:5801 Broadcom Corp. BCM5880 Secure Applications Processor with fingerprint swipe sensor Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. Latitude E6320 Papersize: a4 ProcEnviron: LANGUAGE=fi TERM=xterm PATH=(custom, no user) LANG=fi_FI.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-45-generic.efi.signed root=UUID=0b75be02-897e-4a0b-9ff6-441512bb7493 ro SourcePackage: cups-filters UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/14/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A19 dmi.board.name: 05VMY6 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA19:bd11/14/2013:svnDellInc.:pnLatitudeE6320:pvr01:rvnDellInc.:rn05VMY6:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E6320 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. 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