[Bug 1910587] [NEW] Software Updater reports possible updates, but shows a blank window afterwards. No updates are performed.

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Note: Using terminal apt-get update and apt-get upgrade still seem to
work.

Software Updater will show the available upgrades, and allow me to click
'install now', but after clicking that button, I get a blank window with
no updates.

I've noticed this since the beginning of 2021, approximately.

1) Description:	Ubuntu 20.04.1 LTS
Release:	20.04

2) Software Updater
(update-manager) 1:20.04.10.2

3) I expected the listed upgrades to go through an install process,
eventually being notified all upgrades had been installed and either it
was complete or it required a restart. (This is all through the GUI of
the Software Updater process.)

4) I was shown a blank window from Software Updater and no upgrades are
processed.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: firefox 84.0.1+build1-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-59.65-generic 5.4.78
Uname: Linux 5.4.0-59-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  jason      2220 F.... pulseaudio
 /dev/snd/pcmC0D0p:   jason      2220 F...m pulseaudio
BuildID: 20201221152838
CasperMD5CheckResult: skip
Channel: Unavailable
CurrentDesktop: ubuntu:GNOME
Date: Thu Jan  7 12:09:44 2021
ExecutablePath: /usr/lib/firefox/firefox
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2017-07-04 (1283 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
IpRoute:
 default via 10.0.0.1 dev enx00249b28f1e5 proto dhcp metric 100 
 default via 10.0.0.1 dev wlp2s0 proto dhcp metric 600 
 10.0.0.0/24 dev enx00249b28f1e5 proto kernel scope link src 10.0.0.15 metric 100 
 10.0.0.0/24 dev wlp2s0 proto kernel scope link src 10.0.0.46 metric 600 
 169.254.0.0/16 dev wlp2s0 scope link metric 1000
Locales: extensions.sqlite corrupt or missing
PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:354
PrefSources: prefs.js
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=84.0.1/20201221152838 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to focal on 2020-09-20 (108 days ago)
dmi.bios.date: 04/19/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX330UAK.315
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX330UAK
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX330UAK.315:bd04/19/2019:svnASUSTeKCOMPUTERINC.:pnUX330UAK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX330UAK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: ZenBook
dmi.product.name: UX330UAK
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal third-party-packages wayland-session
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Software Updater reports possible updates, but shows a blank window afterwards. No updates are performed.
https://bugs.launchpad.net/bugs/1910587
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