Printer Queue Brings Desktop to a halt

[Eli]

Hello,
 So I opened up the printer application on Ubuntu 18.04 (I don't use 18.04's default Desktop Environment on 18.04, I use Unity) and right-clicked on the a printer's queue, then right-clicked on the job, then I switched Wi-Fi networks (since it was trying to find a non-existent printer on Verizon's phone network instead of my home Wi-Fi network). Once it switched networks and figured itself and printed the job, the job disappeared, but the menu that was created as a cause of my right-clicking never went away. Literally everything in the desktop environment froze except for the mouse pointer, and I was able to hold down the SUPER key to show the shortcuts, but that was it. I could not click out, SUPER + L, CTRL + ALT + DEL all did not work. The only thing I was able to do was use CTRL + ALT + F3 to get into a terminal window. Once I got into the terminal, I did a:
sudo ps aux |grep printer
sudo kill -9 PID_of_printer_app

and was able to actually get my desktop environment working again.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
Uname: Linux 4.15.0-39-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity:Unity7:ubuntu
Date: Wed Nov 21 02:35:28 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7660G] [1002:9900] (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Trinity [Radeon HD 7660G] [103c:18a6]
InstallationDate: Installed on 2018-10-23 (29 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
LightdmDisplayLog:
 (II) AIGLX: Suspending AIGLX clients for VT switch
 (II) AIGLX: Suspending AIGLX clients for VT switch
 (II) AIGLX: Suspending AIGLX clients for VT switch
MachineType: Hewlett-Packard HP ENVY m6 Notebook PC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-39-generic root=UUID=419e0ab3-d507-43d0-8027-6d9bbdf46e98 ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/22/2013
dmi.bios.vendor: Insyde
dmi.bios.version: F.34
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 18A6
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 74.7F
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.34:bd05/22/2013:svnHewlett-Packard:pnHPENVYm6NotebookPC:pvr087D120022305B10000620100:rvnHewlett-Packard:rn18A6:rvr74.7F:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV
dmi.product.name: HP ENVY m6 Notebook PC
dmi.product.version: 087D120022305B10000620100
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

[Khurshid Alam (khurshid-alam)]

Unity uses system-config-printer. It has lots of similar bugs when printing on network. Please remove unity and mark that as affected.