It was with the Gnome setting. I had to install the kde system dialog to
be able to adjust sound settings without triggering the above-mentioned
bug. Meanwhile this seems to have been solved though. Probably with
updates? Now I can open the Gnome settings dialog without problem.
Thanks.
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You
I confirm I have the same problem.
I had to uninstall gnome-control-center with synaptic and have the kde
systemsettings instead.
It must come from an update during the last days (but before today, since I
noticed the bug before downloading the last upgrade)
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You received this bug
I forgot: I have ubuntu-desktop (gnome) installed, version 12.04 (LTS)
** Changed in: kde-workspace (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1137384