kdebluetooth applet crashed just after initial boot

[outasync]

Binary package hint: kdebluetooth

System freezes frequently - No appearant reason and while running different applications and/or utilities...

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/kblueplugd
InterpreterPath: /usr/bin/python2.6
Package: kdebluetooth 1:0.3-0ubuntu3
ProcCmdline: /usr/bin/python /usr/bin/kblueplugd
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/kblueplugd']
SourcePackage: kdebluetooth
Title: kblueplugd crashed with ImportError in <module>()
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/kblueplugd", line 15, in <module>
     import dbus.mainloop.qt
 ImportError: No module named qt
Uname: Linux 2.6.28-11-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare