I've just installed Ubuntu 12.04 (64-bit, installed using Wubi, if that makes any difference) and everything so far seems to be working fine except for my Logitech G930 wireless headphones.
Despite seeing several messages in another thread saying these headphones work fine with 12.04, I get no sound out of them.
If I open Settings -> Sound, and connect the headphones I can see an entry for them in both the Output and Input tabs, as "Analog Output - Logitech G930 Headset" and "Microphone - Logitech G930 Headset" respectively.
The volume control on the headset controls the volume on the PC, but sound is only heard from the speakers, and never from the headset.
On the Output tab of the sound settings dialog, if I select the headset, then click the test sound button, the test sounds come out of the speakers.
On the Input tab, if I turn the input volume all the way up and talk loudly into the mic, I can hear myself through the headphones.
I have no idea how to troubleshoot this - can anyone help?