Hello all,
I did the same (double) error twice, with obviously the same result twice. The first time, I continue to use the system, which meant that I did not know where was the error.
The objective was to install Firefox 5.0. 1 - I copied a directory /usr/local/firefox/ from a system used before 2 - I tried to edit a firefox icon coming also from the other system, 3 - I completely uninstalled firefox using Synaptic (that did not removed the ~/.mozilla/).
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When you deinstalled Firefox I think you took kubuntu-default-settings-trinity with it. Check to make sure that it is still installed.
Tim