Public bug reported:

When I go in 'paprefs' to either one of the two network tabs, then all
is grayed out (see attached screenshot), and on the right side of each
row, it tells 'Installieren ...' (German locale, in English it means
'install'.

What I report here are two things:

The one thing is that it crashes:

When I click on that 'Installieren ...' (it changes to be a button once
the mouse is over it), the application crashes, and there is this
message on the console from which I startet paprefs:

(paprefs:8331): glibmm-ERROR **: 21:17:31.596:
unhandled exception (type std::exception) in signal handler:
what: basic_string::_M_construct null not valid

The other thing is that it is not possible to use pulse audio over the
network, since the checkboxes are grayed out.

Further information:

I expected that there were checkboxes, which I can click on, and than
pulse audio would work over network, which I can't since the checkboxes
are grayed out.

wind:~ $ lsb_release -rd
Description:    Ubuntu Focal Fossa (development branch)
Release:        20.04

wind:~ $ apt-cache policy pulseaudio
pulseaudio:
  Installiert:           1:13.99.1-1ubuntu2
  Installationskandidat: 1:13.99.1-1ubuntu2
  Versionstabelle:
 *** 1:13.99.1-1ubuntu2 500
        500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

I just did all updates (apt-get updates ; apt-get dist-upgrade).

I have not done any special settings with audio.
I use Pulse Audio Networking on the same computer with Ubuntu 18.04, and it 
works there.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: paprefs 1.1-1build1
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu26
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr 15 21:12:54 2020
InstallationDate: Installed on 2020-04-03 (11 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: paprefs
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2020-04-03T23:24:20.272077

** Affects: paprefs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Attachment added: "Screenshot  just before the crash"
   
https://bugs.launchpad.net/bugs/1873063/+attachment/5354804/+files/Bildschirmfoto_von_2020-04-15_21-25-44.png

** Description changed:

  When I go in 'paprefs' to either one of the two network tabs, then all
  is grayed out, and on the right side of each row, it tells 'Installieren
  ...' (German locale, in English it means 'install'.
  
- What I got are two this:
+ What I report here are two things:
  
  The one thing is that it crashes:
  
  When I click on that 'Installieren ...' (it changes to be a button once
  the mouse is over it), the application crashes, and there is this
  message on the console from which I startet paprefs:
  
- (paprefs:8331): glibmm-ERROR **: 21:17:31.596: 
+ (paprefs:8331): glibmm-ERROR **: 21:17:31.596:
  unhandled exception (type std::exception) in signal handler:
  what: basic_string::_M_construct null not valid
  
- 
- The other thing is that it is not possible to use pulse audio over the 
network, since the checkboxes are grayed out.
- 
+ The other thing is that it is not possible to use pulse audio over the
+ network, since the checkboxes are grayed out.
  
  Further information:
  
  I expected that there were checkboxes, which I can click on, and than
  pulse audio would work over network, which I can't since the checkboxes
  are grayed out.
  
- 
  wind:~ $ lsb_release -rd
  Description:  Ubuntu Focal Fossa (development branch)
  Release:      20.04
  
  wind:~ $ apt-cache policy pulseaudio
  pulseaudio:
-   Installiert:           1:13.99.1-1ubuntu2
-   Installationskandidat: 1:13.99.1-1ubuntu2
-   Versionstabelle:
-  *** 1:13.99.1-1ubuntu2 500
-         500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
-         100 /var/lib/dpkg/status
- 
+   Installiert:           1:13.99.1-1ubuntu2
+   Installationskandidat: 1:13.99.1-1ubuntu2
+   Versionstabelle:
+  *** 1:13.99.1-1ubuntu2 500
+         500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
+         100 /var/lib/dpkg/status
  
  I just did all updates (apt-get updates ; apt-get dist-upgrade).
  
  I have not done any special settings with audio.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: paprefs 1.1-1build1
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 15 21:12:54 2020
  InstallationDate: Installed on 2020-04-03 (11 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  SourcePackage: paprefs
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.default.apport:
-  # set this to 0 to disable apport, or to 1 to enable it
-  # you can temporarily override this with
-  # sudo service apport start force_start=1
-  enabled=0
+  # set this to 0 to disable apport, or to 1 to enable it
+  # you can temporarily override this with
+  # sudo service apport start force_start=1
+  enabled=0
  mtime.conffile..etc.default.apport: 2020-04-03T23:24:20.272077

** Description changed:

  When I go in 'paprefs' to either one of the two network tabs, then all
- is grayed out, and on the right side of each row, it tells 'Installieren
- ...' (German locale, in English it means 'install'.
+ is grayed out (see attached screenshot), and on the right side of each
+ row, it tells 'Installieren ...' (German locale, in English it means
+ 'install'.
  
  What I report here are two things:
  
  The one thing is that it crashes:
  
  When I click on that 'Installieren ...' (it changes to be a button once
  the mouse is over it), the application crashes, and there is this
  message on the console from which I startet paprefs:
  
  (paprefs:8331): glibmm-ERROR **: 21:17:31.596:
  unhandled exception (type std::exception) in signal handler:
  what: basic_string::_M_construct null not valid
  
  The other thing is that it is not possible to use pulse audio over the
  network, since the checkboxes are grayed out.
  
  Further information:
  
  I expected that there were checkboxes, which I can click on, and than
  pulse audio would work over network, which I can't since the checkboxes
  are grayed out.
  
  wind:~ $ lsb_release -rd
  Description:  Ubuntu Focal Fossa (development branch)
  Release:      20.04
  
  wind:~ $ apt-cache policy pulseaudio
  pulseaudio:
    Installiert:           1:13.99.1-1ubuntu2
    Installationskandidat: 1:13.99.1-1ubuntu2
    Versionstabelle:
   *** 1:13.99.1-1ubuntu2 500
          500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status
  
  I just did all updates (apt-get updates ; apt-get dist-upgrade).
  
  I have not done any special settings with audio.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: paprefs 1.1-1build1
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 15 21:12:54 2020
  InstallationDate: Installed on 2020-04-03 (11 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: paprefs
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.default.apport:
   # set this to 0 to disable apport, or to 1 to enable it
   # you can temporarily override this with
   # sudo service apport start force_start=1
   enabled=0
  mtime.conffile..etc.default.apport: 2020-04-03T23:24:20.272077

** Description changed:

  When I go in 'paprefs' to either one of the two network tabs, then all
  is grayed out (see attached screenshot), and on the right side of each
  row, it tells 'Installieren ...' (German locale, in English it means
  'install'.
  
  What I report here are two things:
  
  The one thing is that it crashes:
  
  When I click on that 'Installieren ...' (it changes to be a button once
  the mouse is over it), the application crashes, and there is this
  message on the console from which I startet paprefs:
  
  (paprefs:8331): glibmm-ERROR **: 21:17:31.596:
  unhandled exception (type std::exception) in signal handler:
  what: basic_string::_M_construct null not valid
  
  The other thing is that it is not possible to use pulse audio over the
  network, since the checkboxes are grayed out.
  
  Further information:
  
  I expected that there were checkboxes, which I can click on, and than
  pulse audio would work over network, which I can't since the checkboxes
  are grayed out.
  
  wind:~ $ lsb_release -rd
  Description:  Ubuntu Focal Fossa (development branch)
  Release:      20.04
  
  wind:~ $ apt-cache policy pulseaudio
  pulseaudio:
    Installiert:           1:13.99.1-1ubuntu2
    Installationskandidat: 1:13.99.1-1ubuntu2
    Versionstabelle:
   *** 1:13.99.1-1ubuntu2 500
          500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status
  
  I just did all updates (apt-get updates ; apt-get dist-upgrade).
  
  I have not done any special settings with audio.
+ I use Pulse Audio Networking on the same computer with Ubuntu 18.04, and it 
works there.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: paprefs 1.1-1build1
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 15 21:12:54 2020
  InstallationDate: Installed on 2020-04-03 (11 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: paprefs
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.default.apport:
   # set this to 0 to disable apport, or to 1 to enable it
   # you can temporarily override this with
   # sudo service apport start force_start=1
   enabled=0
  mtime.conffile..etc.default.apport: 2020-04-03T23:24:20.272077

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https://bugs.launchpad.net/bugs/1873063

Title:
  paprefs crashes when attempting to select network access

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