Ubuntu 8.04 users have been facing lots of problems related to sound. This happens when you try to play an embedded flash video inside the browser. This application somewhat locks and doesn’t allow other applications like VLC, Amarok to play anything. Syslog shows
pulseaudio: module-alsa-sink.c: Error opening PCM device front:0: Device or resource busy
The bug has been reported on Launchpad, many other duplicates exist, one of which is here
A workaround is to kill the daemon and restart it again and again. Once I did these steps, it never locks again. The whole thing is still a mystery.
Kill the daemon:
Restart the daemon
pulseaudio -D -vv
You can even try out installing libflashsupport package, but it didn’t do any magic on my system though people claim that it works. Don’t forget to restart the browser and restart the pulseaudio daemon after installing this package.
This whole killing, restarting the daemon is just a workaround. We hope that it gets fixed. This problem is faced the most in Hardy, though even if you are planning to upgrade to Intrepid, be ready to face this bug. I faced this on the desktop at my home.