Can't login in KDE after fresh install

[metrofun]

I have just installed Kubuntu 10.04, but can't login into it.
I enter correct user/pass, then it tries to go into KDE, but suddenly drop back to login window.The same situation with failsafeX.A olso tried different users and several times reinstalled Kubuntu.
Here is my "~/.xsession-errors"

Xsession: X session started for metrofun at Wed Jun 30 20:04:22 EEST 2010
konsole(1091)/kdeui (kdelibs): Attempt to use QAction "change-profile" with KXMLGUIFactory!
x-terminal-emulator: ../../src/xcb_io.c:385: _XAllocID: Assertion `ret != inval_id' failed.
KCrash: Application 'x-terminal-emulator' crashing...
Warning: connect() failed: : No such file or directory
KCrash cannot reach kdeinit, launching directly.
No protocol specified
drkonqi: cannot connect to X server :0.0

[metrofun]

bump
i can't use kubuntu on my desktop (

[metrofun]

I found topic with similar problem in lot of users
http://ubuntuforums.org/showthread.php?p=9550152#post9550152

[Kahoss]

Ok, I first install Ubuntu 11 with GNOME, them updated to KDE restart the computer and the user name and password do not work ....... solutions ???? pleaseee !!