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ubuntu 16.04 boot 启动报错
1，ubuntu系统版本
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
2，dns-clean.service 报错
- boot 输出错误信息
[Failed] Failed to start Clean up any mess left by Odns-up. See systemctl status dns-clean.service for details.
- 修改dns-clean.service文件mkdir添加-p参数
# vim /lib/systemd/system/dns-clean.service
#ExecStartPre=/bin/mkdir /var/run/pppconfig
ExecStartPre=/bin/mkdir -p /var/run/pppconfig
# reboot
3，plymouth-quit.service报错，待解决
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