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when the computer stays locked for a long time (let's say, the whole night), a 
taskbar appears on top of the lock screen.
when unlocked, it seems that there is 2 taskbars (with little margin 
differences, see attached screencast).

config : ubuntu 18.10
standart ubuntu desktop
dock configured at bottom
no gnome extension activated
many applications running (haven't done the test without apps running)

apps are still launchable, only the margin difference is annoying.
haven't tried to launch app from the lock screen, it may be a security issue.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xorg 1:7.7+19ubuntu8
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.07.00.0: Error: [Errno 21] est un dossier: 
'/proc/driver/nvidia/gpus/0000:07:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  415.27  Thu Dec 20 17:25:03 
CST 2018
 GCC version:  gcc version 8.2.0 (Ubuntu 8.2.0-7ubuntu1)
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 29 09:28:53 2019
DistUpgraded: 2018-10-22 03:09:20,483 DEBUG icon theme changed, re-reading
DistroCodename: cosmic
DistroVariant: ubuntu
DkmsStatus:
 nvidia, 415.27, 4.18.0-13-generic, x86_64: installed
 virtualbox, 5.2.18, 4.18.0-13-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 NVIDIA Corporation GP104 [GeForce GTX 1070 Ti] [10de:1b82] (rev a1) (prog-if 
00 [VGA controller])
   Subsystem: Device [196e:1215]
InstallationDate: Installed on 2018-04-03 (300 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
MachineType: Gigabyte Technology Co., Ltd. AB350M-Gaming 3
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-13-generic 
root=UUID=ea369caf-e759-4349-904a-b584e8d71d5b ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to cosmic on 2018-10-22 (99 days ago)
dmi.bios.date: 12/25/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F24
dmi.board.asset.tag: Default string
dmi.board.name: AB350M-Gaming 3-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF24:bd12/25/2018:svnGigabyteTechnologyCo.,Ltd.:pnAB350M-Gaming3:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnAB350M-Gaming3-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: Default string
dmi.product.name: AB350M-Gaming 3
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.95-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.3.1-0~c~padoka0
version.libgl1-mesa-glx: libgl1-mesa-glx 18.3.1-0~c~padoka0
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3

** Affects: gnome-shell-extension-ubuntu-dock (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug cosmic third-party-packages ubuntu
-- 
dual taskbar ?
https://bugs.launchpad.net/bugs/1813735
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