Comment 46 for bug 214370

Woohoo! Thanks David!!

Although this is a workaround, there is no problem with it, it does the desired behavior (i.e. plays the shutdown/logout sound on logout and shutdown) and conforms with all the necessary configuration (i.e. if in Preferences > Sound you have sounds disabled, it will not play).

I shall create a debdiff with a patch, in the mean time, will people try it out and comment if the workaround doesn't work for them (make sure in Sound > Preferences, you have the Ubuntu theme selected and the alert volume is loud enough).