设置开机自启一般都在rc.local文件里设置，但是有的Ubuntu版本没有这个文件，此时可以自己创建一个。

创建rc.service文件

vi /etc/systemd/system/rc.service

粘贴以下内容到文件里

[Unit]
 Description=/etc/rc.local Compatibility
 ConditionPathExists=/etc/rc.local

[Service]
 Type=forking
 ExecStart=/etc/rc.local start
 TimeoutSec=0
 StandardOutput=tty
 RemainAfterExit=yes
 SysVStartPriority=99

[Install]

 WantedBy=multi-user.target

启动rc.service服务并设置开机自启

systemctl start rc.service
systemctl enable rc.service

/etc/rc.local文件

vi /etc/rc.local

粘贴以下内容到文件里

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
exit 0