*** This bug is a duplicate of bug 1296425 ***
https://bugs.launchpad.net/bugs/1296425
I found the root cause and wrote it in comments 21 and 22 of the
duplicate bug:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-
common/+bug/1296425
SUMMARY: ubuntu-drivers-common scripts (sl-modem.py) are calling "aplay
-l" with an empty environment, thus "aplay -l" creates a new
"pulseaudio" process instead of using the session's pulseaudio, which
interferes with sound card recognition (device busy errors). There is a
one liner fix in the comment. Kubuntu calls ubuntu-drivers-common
scripts on login to KDE, but the issue affects also Ubuntu users if they
run any program that calls those scripts, until they restart.
Cheers,
Juan Manuel Cabo
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https://bugs.launchpad.net/bugs/1325282
Title:
USB microphone inputs not detected by Pulseaudio on Kubuntu Trusty
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