This sounds like bug 1824874. To help us check that please:
1. Provide a screenshot or photo of the problem; and
2. After the dialog has appeared run:
journalctl -b0 > journal.txt
or if you had to reboot then run:
journalctl -b-1 > prevboot.txt
and attach the resulting text file here.
** Package changed: xorg (Ubuntu) => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1882481
Title:
A dialog box stays on desktop and does not go away
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
Upon rebooting, I get dialog box
Authentication Required
Authentication is required to start 'cups.service'.
I can type in the password and click Authenticate, but then nothing
happens. I can't see under the box. I can't move the box, can't cancel
the dialog.
But, I can click on where I know the underneath icon to be and that
click is accepted and the program in question runs. It appears the
display manager does not remove the image after it is done with the
dialog.
I have recently done a clean install of 20.04.
There is a screenshot in this Stack Exchange post:
https://askubuntu.com/questions/1242999/dialog-box-does-not-accept-input-stays-on-top-and-hides-everything-under-it-ub
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Uname: Linux 5.4.0-33-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun 7 23:10:43 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
amdgpu, 3.3-19, 5.4.0-31-generic, x86_64: installed
amdgpu, 3.3-19, 5.4.0-33-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX
470/480/570/570X/580/580X/590] [1002:67df] (rev e7) (prog-if 00 [VGA
controller])
Subsystem: Micro-Star International Co., Ltd. [MSI] Radeon RX 580
[1462:8a92]
InstallationDate: Installed on 2020-05-12 (26 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: System manufacturer System Product Name
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-33-generic
root=UUID=ebb08f84-7501-4461-a5c4-c69c3c25d9b0 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/30/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0804
dmi.board.asset.tag: Default string
dmi.board.name: ROG ZENITH EXTREME
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0804:bd11/30/2017:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGZENITHEXTREME:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.14.1+20.04.20200211-0ubuntu1
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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