当我在 Ubuntu 18.04 上 ping google.com 时，它给了我
ping: google.com: Temporary failure in name resolution
然后我会继续跑步
sudo service systemd-resolved start
我的 /etc/resolv.conf 有一个符号链接，如图所示
/etc/resolv.conf -> /run/systemd/resolve/stub-resolv.conf
内容如下
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists all
# configured search domains.
#
# Run "systemd-resolve --status" to see details about the uplink DNS servers
# currently …