我正在运行 Ubuntu 20.04.3 LTS。
启动后，连接到我的 VPN 之前，我的/etc/resolv.conf外观如下：
# 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 "resolvectl status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.
nameserver 127.0.0.53
options edns0 trust-ad
当我连接到我的 VPN 时它会发生改变并且看起来像这样：
# Perimeter81 Custom DNS
nameserver 10.127.248.1
但是当我断开与 VPN 的连接时，它无法正确重新生成，最终只留下一条评论：
# Generated by resolvconf
...当然，查找功能不起作用。我必须断开/重新连接我的 wifi，然后它就会恢复到原来的状态。
因此，似乎 VPN 断开时触发的重新生成 resolv.conf 的操作与最初设置的操作不同。我该如何修复它？