KDE4 programs won't start

[Anschel Schaffer-Cohen]

Binary package hint: kde4

No KDE4 apps will start, including KWord, Knetwalk, and KDE4 itself. All of these worked before a recent upgrade, and they all work (or their equivalents under KDE3)

trying to run knetwalk gives the following error:

anschel:~% /usr/lib/kde4/bin/knetwalk
Fatal error: you need to have a KComponentData object before
you do anything that requires it! Examples of this are config
objects, standard directories or translations.
zsh: abort (core dumped) /usr/lib/kde4/bin/knetwalk

and kword:

anschel:~% kword-kde4
Fatal error: you need to have a KComponentData object before
you do anything that requires it! Examples of this are config
objects, standard directories or translations.
Aborted (core dumped)

(this is not a zsh error, i get the same error with bash)

how do i find the core dump?

[PromoGest (m3nt0r3)]

smplayer
Fatal error: you need to have a KComponentData object before
you do anything that requires it! Examples of this are config
objects, standard directories or translations.
Aborted (core dumped)

[Anschel Schaffer-Cohen (anschelsc)]

Additional information:

I think this is a qt4 problem, because LyX 1.5.3 gives the same error.

lyx --version gives:
LyX 1.5.3 (Mon, Dec 17, 2007)
Built on Jan 4 2008, 12:58:21
Configuration
  Host type: i486-pc-linux-gnu
  Special build flags: aiksaurus pch warnings use-aspell use-ispell
  C Compiler: gcc
  C Compiler LyX flags:
  C Compiler flags: -Wextra -Wall -g -O2
  C++ Compiler: g++ (4.2.3)
  C++ Compiler LyX flags:
  C++ Compiler flags: -Wextra -Wall -g -O2
  Linker flags:
  Linker user flags: -Wl,-z,defs -Wl,--as-needed
  Qt 4 Frontend:
      Qt 4 version: 4.3.3
  Packaging: posix
  LyX binary dir: /usr/bin
  LyX files dir: /usr/share/lyx

[Rich Johnson (nixternal)]

This is not a qt4-x11 issue. The problem is due to a crack upload of the kubuntu-default-settings package. To fix this issue, simply remove /etc/kde4rc, log off and then back on. Everything will work as planned.

The fix has also been released with an updated kubuntu-default-setting package that removes the kde4 parts from the file for the time being.

[Luis Alberto Pabón (copong)]

I come from #193525. Deleting /etc/kde4rc did it for me. Thanks!!