Comment 4 for bug 755297

@Jonathan : True. I have both kubuntu-desktop and ubuntu-desktop installed on said machine, and I discovered that this comes from speech-dispatcher, which is a dependancy of Orca, which in turn is a "recommend" of ubuntu-desktop.

The matter is that this Orca misbehaves in a KDE session. Well, I uninstalled it, having no need for it.

I've however seen the same behaviour on all 3 machines on which I have both Gnome and KDE. I never installed Orca manually on any, didn't event know what it's supposed to be, so I believed it auto-installed each time with ubuntu-desktop...

Ubuntu auto-installs much too many things one may not need (such as brltty for Braille terminals, I'm about sure that less than 0.5% of Ubuntu users ever need it or know what it is), such "accessibility" packages should definitely be optional rather than bloat and swell the default installation, where they are useless most of the times.