Hi,

I'm trying Lubuntu 12.10 on an iMac G3 600MHz SE, and I had sound on the first go, but later the sound stopped working.

After trying the solution posted here:
https://wiki.ubuntu.com/PowerPCFAQ#W...ve_no_sound.3F

I realized that I was down the wrong path. The problem was I had muted the sound just before the problem started, and now I see that the problem is the GUI Mute button on the LXDE desktop: I have filed a bug report.

Read the details here:
https://bugs.launchpad.net/ubuntu/+s...a/+bug/1080790

Basically, don't mute the volume using the GUI checkbox for Lubuntu on an iMac, or you won't get audio back when you uncheck it.