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Until recently I was using the default environment when installing Ubuntu, that is Unity. I just install KDE using the command sudo apt-get install kde-plasma-desktop. When I open programs such as Firefox, LibreOffice, etc., their menus look terrible.

I suspect it has something to do with GTK+, but I don't know how to solve the problem. Is there a package that has not been installed by running the command sudo apt-get install kde-plasma-desktop?

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Would you provide us a screenshot? – OrangeTux Feb 5 '13 at 9:44

I wrote about this issue some time ago; please look it up on my blog. First, you need to download gtk-theme-switch Install gtk-theme-switch and gtk2-engines-oxygen Install gtk2-engines-oxygen. Then, start up gtk-theme-switch2 and select oxygen as the new theme. After restarting your application, your kde application should look normal again.

sudo apt-get install gtk-theme-switch gtk2-engines-oxygen
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sorry about that, I've edited the post again! Thanks for the correction though – latz Feb 6 '13 at 10:56

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