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I am using Kubuntu 14.10 and it's working quite well so far, but my problem is pretty much what it's stated in the title, when executing a GTK app that requires sudo privileges, such as Synaptic package manager, it's displayed with an ugly theme and huge fonts. However if starting the app without sudo, oxygen-gtk theme is respected. Sometimes the app won't even run until next reboot, displaying a message in terminal about not being able to open display X.

I've tried every possible theme in "System configuration -> Application appearance -> GTK" and other fixes suggested on forums around the web and even here in askubuntu but nothing seems to work. Any suggestions?

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possible duplicate: Preserving GTK theme with gksudo – David Foerster Dec 21 '14 at 2:26
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Run the command below and re-apply the oxygen-gtk theme:

kdesudo systemsettings
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By the help.ubuntu.com/community/RootSudo : "You should never use normal sudo to start graphical applications as Root. You should use gksudo (kdesudo on Kubuntu) to run such programs..." – user26687 Dec 21 '14 at 12:13
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Copy everything gtk-3.0 and .gtkrc-20 from ~, ~/.config, ~/.kde/share/config to /root.

That's how my synaptic renders Kubuntu's Oxygen-GTK theme.

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welcome to Ask Ubuntu it is highly unrecommended to copy anything to your root folder – Mudit Kapil Feb 26 '15 at 6:11
    
The was no recommendation to do anything. .There simply was an answer to a question which presented a problem. You did not address the question or the problem, but saw fit to downgrade the answer. That does not seem productive. – user78791 Feb 26 '15 at 17:28

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