Public bug reported:

Unable to run "Software & Updates" from either the app menu nor Synaptic
via Settings -> Repositories. The following error is generated:

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

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: software-properties-gtk 0.99.42
ProcVersionSignature: Ubuntu 6.8.0-11.11-generic 6.8.0-rc4
Uname: Linux 6.8.0-11-generic x86_64
ApportVersion: 2.28.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar  8 08:56:53 2024
InstallationDate: Installed on 2023-11-02 (127 days ago)
InstallationMedia: Ubuntu 24.04 "Noble Numbat" - Daily amd64 (20231101)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble wayland-session

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Ubuntu.
https://bugs.launchpad.net/bugs/2056557

Title:
  Software & Updates does not currently work in 24.04

Status in software-properties package in Ubuntu:
  New

Bug description:
  Unable to run "Software & Updates" from either the app menu nor
  Synaptic via Settings -> Repositories. The following error is
  generated:

  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

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: software-properties-gtk 0.99.42
  ProcVersionSignature: Ubuntu 6.8.0-11.11-generic 6.8.0-rc4
  Uname: Linux 6.8.0-11-generic x86_64
  ApportVersion: 2.28.0-0ubuntu1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar  8 08:56:53 2024
  InstallationDate: Installed on 2023-11-02 (127 days ago)
  InstallationMedia: Ubuntu 24.04 "Noble Numbat" - Daily amd64 (20231101)
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: software-properties
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/2056557/+subscriptions


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