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Problem: There is no sound after ubuntu 18 is installed
Method 1: Check whether the system sound is closed or not.
Run alsamixer in the terminal, select HDA Intel PCH item, and switch to the sound card. Check if there is an MM item, MM indicates a closed channel, press the M key to open the corresponding item. As shown in the figure below:
Method 2: If the above operation is not successful, perform the following options:
sudo gedit /etc/modprobe.d/alsa-base.conf
末尾添加：
options snd-hda-intel model=generic
options snd-hda-intel dmic_detect=0
sudo gedit /etc/modprobe.d/blacklist.conf
末尾添加：
blacklist snd_soc_skl
重启系统即可。