@Luke Yelavich:

Hi, I've submitted apport info as per your instructions and sorry for filing 
incomplete bug report previously.
By the way, I've solved the sound issue by Quick&Dirty trick, here's how did 
it, may be its useful for other users who faced this issue like me.

-Since my sound card worked properly in Lucid, and in Maverick, it was
detected but didn't worked, I found somewhere on web that these issues
have something to do with alsa-base.conf located in '/etc/modprobe.d/'.

-I booted to Lucid and in live session, I opened same file in 'File
System' created by Lucid, I compared it with the file existed in my
Maverick installation, and found a "Line" that didn't existed in that of
Lucid, so I just commented that Line in Maverick's 'alsa-base.conf'.
(following line didn't existed in Lucid's alsa-info.conf, so I commented
it in Maverick as shown below.). The line was filed under section
commented as "Prevent abnormal drivers from grabbing index 0", so this
module couldn't get higher priority which made my sound card silent, I
guess ;-)

#options snd-usb-ua101 index=-2

-I booted to Maverick again and things were perfectly fine. (I also need
to change preferred sound device from 'Sound Preferences').

-Note that this may not be the case for other hardware types, but this
method may work for you as it worked for me.

Now, speakers are working absolutely fine as they were in Lucid.... : D

-- 
No sound in fresh install of Ubuntu 10.10
https://bugs.launchpad.net/bugs/661340
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