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I'm having this problem and I wanted to know if there's ananswer for it:

Yesterday I installed KDE (kubuntu-desktop) on my Ubuntu 12.10, and it was working great. Today when I try to start again in KDE it loads the splash screen with the Hard drive, the settings icon and some more, but then it gets black. The Alt+F2 command is not working, but I managed to open a terminal and log in there with Ctrl+Alt+F1. From there I tried to execute plasma-desktop command to open the environment, but there's an error that says:

QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.

plasma-desktop(5939): KUniqueApplication: Cannot find the D-Bus session server: "Unable to autolaunch a dbus-daemon without a $DISPLAY for X11"

plasma-desktop(5938): KUniqueApplication: Pipe closed unexpectedly.

If anyone knows whats wrong or what should I do I would really appreciate it. I hope I've been clear enough. If not please tell me and I'll try to explain better. Thanks in advance.

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I don't know why KDE doesn't start, but plasma isn't working because it lacks a display, try to run 'DISPLAY=:0 plasma-desktop'. – Javier Rivera Dec 13 '12 at 20:31
I put the command and it gave a bunch of code lines, after that it opened the environment. Thanks a lot, but I have one more question: Do I need to run that command every time I log in? Thanks again friend, have a nice day. – Santiago Dec 13 '12 at 20:55
It's working fine but I don't have good control of the window manager. I maximize a window and lose the controls of it. Perhaps I can find a way to restart it. Any news I'll put them here. – Santiago Dec 13 '12 at 21:07

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