it gave me a starting point for the audio but it didn't do much. Here is what happened:

First I had to figure out which method my system used so :

bmike1@c521 ~ $ sudo dpkg-reconfigure alsa
bmike1@c521 ~ $ sudo dpkg-reconfigure pulse
bmike1@c521 ~ $ sudo dpkg-reconfigure jack
bmike1@c521 ~ $ sudo dpkg-reconfigure jackd

all of which gave me a similar error

dpkg-query: package 'jackd' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files,
and dpkg --contents (= dpkg-deb --contents) to list their contents.
/usr/sbin/dpkg-reconfigure: jackd is not installed

finally I happened upon:

bmike1@c521 ~ $ sudo dpkg-reconfigure pulseaudio
Processing triggers for libc-bin (2.19-0ubuntu6.6) ...

But that didn't help any. So I suppose I'll look at the man page and see if any of the options help:

bmike1@c521 ~ $ man dpkg-reconfigure
bmike1@c521 ~ $ sudo dpkg-reconfigure --default-priority pulseaudio
Processing triggers for libc-bin (2.19-0ubuntu6.6) ...
bmike1@c521 ~ $ sudo dpkg-reconfigure --force pulseaudio
Processing triggers for libc-bin (2.19-0ubuntu6.6) ...
 
Nope. Looking at the man pages it seems as if you are supposed to be presented with configuration questions. Hmmmmmm..... I got none of that.


On Tue, Dec 22, 2015 at 8:57 PM, Todd Millecam <tyggna@gmail.com> wrote:
The general problem with the Ubuntu graphical frontend is that it's the absolute end of the chain.  If everything up to it is working, then it works fine.  If any link upstream is broken, then it's useless.

In the case of sound, the general chain goes as follows:

kernel->pci or usb bus->udev rules -> alsa or pulse -> ubuntu config and application

Anything along that chain could be busted.  My bet, pulse and alsa are fighting, which is usually the case.  Alsa is a direct link into your sound card and will accept mathematical wave functions as input and output sound.  Pulseaudio or Jackd is a digital mixer, so it takes all the applications that wants sound, mixes them together, and then sends the final waveform up the chain.  Check these programs and use those names to start your troubleshooting/debugging search.

If you want the easy way to do things, try using the internal "dpkg-reconfigure" to just reinstall pulse, or jack, or alsa, or whatever is giving you trouble--kinda hard to know which from a "sound is not working" statement alone.


As for the scanner, that's almost guaranteed to be a udev problem, it's chain looks about like:
kernel->usb bus->udev rules->sane stack->application

Hope that gives you a starting point.

On Tue, Dec 22, 2015 at 6:47 PM, Michael Havens <bmike1@gmail.com> wrote:
I wonder what is happening! First the scanner stopped being detected and now the sound stopped working. I went to the control center -> sound preferences and selected the hardware tab and it says tha there are no devices to configure. I then select the output tab and it says it is Dummy output. What is going on?

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