Comment 7 for bug 123917

In my case it was the following:

-> Fresh install of Kubuntu Gutsy with the i386 desktop CD, Tribe 2.
(The machine is an old Sony Vaio PCG XG-19.)

-> Upgrade all packages from the repository.

(I should note at this point that there's something broken about the
repository or Tribe 2, because the Adept tells me it would break packages.
I haven't gotten to the bottom of it yet, but I think it's unrelated.)

-> Use Adept to select a list of other packages. (This was done all at
once.) Of course, other packages may be installed because of this.

*) kde-amusements
*) kde-extras
*) kde-devel
*) kde-devel-extras
*) kde-hal-device-manager
*) koffice
*) kdesvn
*) smb4k
*) wlassistant
*) gxine
*) gxine-plugin
*) lynx
*) wireshark
*) eclipse
*) gfortran
*) dpkg-dev
*) emacs
*) antiword
*) g++
*) autoconf
*) rubygems
*) rdesktop
*) mplayer
*) firefox-mplayer
*) mencoder
*) tcsh
*) firefox

-> Try to start Firefox.

I said in the original bug report, I believe I had 2.0.0.4+2-0ubuntu3.

I will try this all again sometime in the next several days.