[Bug 1945557] [NEW] Load updates progress bars list does not fill all available space

[Mingun]

Public bug reported:

See the screenshot

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: update-manager 1:20.04.10.9
ProcVersionSignature: Ubuntu 5.4.0-87.98-generic 5.4.140
Uname: Linux 5.4.0-87-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Sep 30 09:07:57 2021
InstallationDate: Installed on 2020-11-24 (309 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug focal third-party-packages

** Attachment added: "Loading updates.png"
   https://bugs.launchpad.net/bugs/1945557/+attachment/5529267/+files/Loading%20updates.png

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https://bugs.launchpad.net/bugs/1945557

Title:
  Load updates progress bars list does not fill all available space

Status in update-manager package in Ubuntu:
  New

Bug description:
  See the screenshot

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: update-manager 1:20.04.10.9
  ProcVersionSignature: Ubuntu 5.4.0-87.98-generic 5.4.140
  Uname: Linux 5.4.0-87-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.20
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Sep 30 09:07:57 2021
  InstallationDate: Installed on 2020-11-24 (309 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=ru_RU.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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