Can not configure software sources with Muon

[Kryol]

I can't configure sotware sources with Muon. If I click on Settings > Configure Software Sources then
I see:
And no configure window apeears.
Then

apt-get update

invoked

How to access Configure Software Sources window?

[Snowhog]

You type in your user password and press Enter.

[Kryol]

You type in your user password and press Enter.

Yes but no Configure Software Sources window
I see following instead:

[OneLine]

What will happen if you launch the "Configure Software Sources" (software-properties-kde) from the konsole ?
Command:

kdesudo software-properties-kde

:~$ software-properties-kde --help
Usage: software-properties-kde [Qt-options] [KDE-options] [options]

Software Sources List editor

Generic options:
--help Show help about options
--help-qt Show Qt specific options
--help-kde Show KDE specific options
--help-all Show all options
--author Show author information
-v, --version Show version information
--license Show license information
-- End of options

Options:
--debug Print some debug information to the command line
--massive-debug Print a lot of debug information to the command line
--dont-update No update on repository change (useful if called from an external program)
--enable-component <name> Enable the specified component of the distro's repositories [component_arg]
--enable-ppa <name> Enable PPA with the given name [ppa_arg]
--keyserver <url> URL of keyserver [keyserver_url]
--attach <WinID> Win ID to act as a dialogue for [attach_arg]

[Kryol]

Hmmm,

$ kdesudo software-properties-kde
kdesudo(1979) KDESu::KDESuPrivate::KCookie::getXCookie: No X authentication info set for display  ":0" 

QProcess: Destroyed while process is still running.
software-properties-kde: cannot connect to X server

Moreover I have same for all kdesudo's from konsole.

I'll look for problem here

[Kryol]

Fixed. I added "DISPLAY XAUTHORITY" to Defaults env_keep in /etc/sudoers and all works fine.