1.修改vim /etc/hosts文件，自定义主机名，这里修改为Ubuntu-130
vim /etc/hosts
127.0.0.1 localhost
127.0.1.1 ubuntu-130
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
