Public bug reported:

Pro primo: Software & Updates cannot start, when I click to the button, it does 
not show anything. When I try to launch it from the terminal with 
software-properties-gtk, I get a beautiful error message:
Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 100, in <module>
    app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, 
file=file)
          
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File 
"/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py",
 line 163, in __init__
    SoftwareProperties.__init__(self, options=options, datadir=datadir,
  File 
"/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 
109, in __init__
    self.backup_sourceslist()
  File 
"/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 
437, in backup_sourceslist
    source_bkp = SourceEntry(line=source.line,file=source.file)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 509, in 
__init__
    raise ValueError("Classic SourceEntry cannot be written to .sources file")
ValueError: Classic SourceEntry cannot be written to .sources file

I can program in Python at a medium level, but it is too much for me.
Application version: 0.99.42

Pro secundo: Software Updater crashes without any error message, when I
empty the checkbox of an arbitrary package. Application version:
1:24.04.4

Excluded that and a few such errors, congratulations for Noble Numbat,
it is really nice!

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: update-manager 1:24.04.4
ProcVersionSignature: Ubuntu 6.6.0-14.14-generic 6.6.3
Uname: Linux 6.6.0-14-generic x86_64
ApportVersion: 2.28.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Mon Feb 26 07:46:09 2024
GsettingsChanges:
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'launch-count' b'74'
 b'com.ubuntu.update-manager' b'launch-time' b'int64 1708923558'
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'window-width' b'645'
InstallationDate: Installed on 2023-07-05 (236 days ago)
InstallationMedia: Ubuntu 20.04.6 LTS "Focal Fossa" - Release amd64 (20230316)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: update-manager
UpgradeStatus: Upgraded to noble on 2024-02-24 (2 days ago)
modified.conffile..etc.init.d.apport: [modified]
mtime.conffile..etc.init.d.apport: 2024-02-22T15:20:00

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


** Tags: amd64 apport-bug noble

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https://bugs.launchpad.net/bugs/2055007

Title:
  Software & Updates simply does not start, Update Manager crashes when
  I try to check out the checkbox of an update.

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