The issue is with Wayland. While Ubuntu defaults to an X11 session, for some reason they left it enabled for GDM.

Ubuntu18.04重启之后会出现无法连接网络的问题，排查得问题出现在DNS上，然而中文社区对这个方法的解决都不甚令人满意，折腾了半个晚上，才发现This is pretty simple to fix though.

Edit the file /etc/network/interfaces

1
2
3

# The primary network interface
auto ens33
iface ens33 inet dhcp