cups 2.1.3-4 causes Lubuntu 16.04 to hang on shutdown

[Bill Miller]

cups 2.1.3-3 does not have this problem. Confirmed on 32 bit virtual and real machines. Problem was reported on VM.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: cups 2.1.3-4
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic i686
ApportVersion: 2.20-0ubuntu3
Architecture: i386
CasperVersion: 1.368
CupsErrorLog:

CurrentDesktop: LXDE
Date: Tue Apr 19 15:12:05 2016
LiveMediaBuild: Lubuntu 16.04 LTS "Xenial Xerus" - Beta i386 (20160323)
Lpstat: Error: command ['lpstat', '-v'] failed with exit code 1: lpstat: No destinations added.
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 002: 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
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash ---
SourcePackage: cups
UpgradeStatus: No upgrade log present (probably fresh install)
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.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH

[Bill Miller (wbmilleriii)]

cups isn't included in the Lubuntu "final" build. So I installed it manually to get printing to work, and it causes this problem. Maybe that's why they left it out! It was in beta 2 and worked ok there, it was the 2.1.3-3 version.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Bryan Quigley (bryanquigley)]

This seems like it's common - https://askubuntu.com/questions/760952/slow-shutdown-on-ubuntu-16-04-lts-stopping-thermal-daemon-running-fit-make-remo#763803

Did you have to do anything to make it reproduce in a VM?