1.继续分析原因，调试音频功能。

音频配置步骤

1.apt-get install alsa-utils alsa-base linux-sound-base

2.apt-get install pavucontrol

3.cp /etc/udev/ /usr/share/alsa/ucm var/lib/alsa/asound.state

如果报错如下
kylin@ubuntu:~/work/rootfs/nanjingyidong/firefly-rk3399-linux-repack/output/Image$ sudo chroot 1
chroot: failed to run command ‘/bin/bash’: Exec format error

安装
sudo apt-get install qemu-user-static