I enabled the lucid-proposed repository (per comment #4) and installed the generic-pae version of the 2.6.32-62.125 kernel. I can confirm that sound operation returned to normal and the applications which were hanging, like Firefox and ThunderBird, are now working normally again.
I enabled the lucid-proposed repository (per comment #4) and installed the generic-pae version of the 2.6.32-62.125 kernel. I can confirm that sound operation returned to normal and the applications which were hanging, like Firefox and ThunderBird, are now working normally again.