====== 无法识别声卡 ======

删除 timidity 即可

  sudo apt-get purge timidity
  
https://bbs.archlinux.org/viewtopic.php?id=154002


====== blue:  Protocol not available错误解决方案 ======

  # pactl load-module module-bluetooth-discover

  
====== 解决pulseaudio没有输出设备 ======

https://askubuntu.com/questions/976375/kubuntu-17-10-no-audio-devices-found-no-settings-no-sound

  I had the exact same problem (same symptoms) and ended up wasting hours looking for a solution. I solved the issue by editing default.pa to statically load modules and replaced hw:1,0 with hw:0,0

  sudo nano /etc/pulse/default.pa
  Content to change:

  load-module module-alsa-sink device=hw:0,0  
  load-module module-alsa-source device=hw:0,0  
  load-module module-null-sink  
  load-module module-pipe-sink  
  Save and exit, then run:

  sudo alsa force-reload  
  pulseaudio -k  
  start-pulseaudio-x11  
  Hopefully you have sound at this point.