Okay, so we can probably conclude that the audio is not working on Dell
Optiplex 380.

I'm not an expert on this just yet, but I'm writing down some notes of
what I can see:

First; According to Dell's datasheet, the codec chip is "ALC269Q", something I 
don't see in the Linux sources. Also there is no sign of "dell" on alc269. 
So my guess is that Dell Optiplex 380 is a relatively new computer, whose audio 
has never worked on any Linux distro. Is this correct or has the same computer 
audio working on earlier Ubuntu releases?

Looking at dmesg, I find this row: ALC269: SKU not ready 0x411111f0. I'm
not sure what SKU means, @Daniel T Chen, do you know? Anyway, it seems
to look at a specific widget node, which is probably a different node
for this chip, but I'm not sure what  alc_auto_parse_customize_define
actually is supposed to do, and why.

Also, if I look at the codec proc file through codecgraph, I see that it
looks terribly misconfigured. One should take hda-analyzer and tweak
some settings to see if that actually makes things work.

** Changed in: alsa-driver (Ubuntu)
       Status: Incomplete => Confirmed

** Summary changed:

- [Realtek ALC259] ALSA test tone not correctly played back
+ No sound on Dell Optiplex 380 (ALC269Q, probably new chip)

-- 
No sound on Dell Optiplex 380 (ALC269Q, probably new chip)
https://bugs.launchpad.net/bugs/582199
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