我刚刚更新到 24.04。从那时起，我的机器就无法解析任何 DNS 名称，因此无法更新或安装任何软件包。
我已关注过许多论坛帖子，它们都要求编辑 resolv.conf，但我的文件（符号链接）指向的目录中不存在的位置（../run/systemd/resolve/stub-resolv.conf）。我没有安装 resolvconf 包，由于存在持续问题，我无法安装它。我还停止并禁用了 NetworkManager，然后重新启动/启用它，但没有任何效果。
我见过的每个人都遇到过这个问题，他们使用 resolvconf 之类的工具来解决这个问题，但出于某种原因，我无法访问任何工具，也不知道如何获取它们。我通过 WiFi 连接在笔记本电脑上运行 ubuntu。
ip 输出：
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host noprefixroute
valid_lft forever preferred_lft forever
2: wlp58s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 9c:b6:d0:ef:6c:19 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.201/24 brd 192.168.1.255 scope global dynamic noprefixroute wlp58s0
valid_lft 42702sec preferred_lft 42702sec
inet6 2603:7080:8e3a:8902::1c9b/128 scope global dynamic noprefixroute
valid_lft 604303sec preferred_lft 604303sec
inet6 fd00:9491:7fc3:b5f8::1c9b/128 scope global dynamic noprefixroute
valid_lft 604303sec preferred_lft 604303sec
inet6 2603:7080:8e3a:8902:af17:8baa:5232:da2d/64 scope global temporary dynamic
valid_lft 604303sec preferred_lft 85374sec
inet6 2603:7080:8e3a:8902:e2fc:6c92:8de0:ebf/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 604544sec preferred_lft 604544sec
inet6 fd00:9491:7fc3:b5f8:5ea7:41c5:3642:973f/64 scope global temporary dynamic
valid_lft 604303sec preferred_lft 85374sec
inet6 fd00:9491:7fc3:b5f8:2a38:8896:de03:8d4d/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 604544sec preferred_lft 604544sec
inet6 fe80::2873:cef:157f:5a57/64 scope link noprefixroute
valid_lft forever preferred_lft forever
resolvectl 状态输出：
Command 'resolvectl' not found, but can be installed with:
sudo apt install systemd-resolved # version 253.5-1ubuntu7, or
sudo apt install systemd # version 253.5-1ubuntu7
cat /etc/netplan/* 输出：
network:
version: 2
wifis:
NM-23531f6d-4afa-4d4e-b910-600d048bcaf3:
renderer: NetworkManager
match:
name: "wlp58s0"
dhcp4: true
dhcp6: true
access-points:
"":
auth:
key-management: "psk"
password: ""
networkmanager:
uuid: "23531f6d-4afa-4d4e-b910-600d048bcaf3"
name: ""
passthrough:
wifi-security.auth-alg: "open"
ipv6.addr-gen-mode: "default"
ipv6.ip6-privacy: "-1"
proxy._: ""
networkmanager:
uuid: "23531f6d-4afa-4d4e-b910-600d048bcaf3"
name: ""
network:
version: 2
wifis:
NM-32c63030-6242-4279-9e5a-a055eeb8d8d9:
renderer: NetworkManager
match:
name: "wlp58s0"
dhcp4: true
dhcp6: true
ipv6-address-generation: "stable-privacy"
access-points:
"14mn":
auth:
key-management: "psk"
password:
networkmanager:
uuid: "32c63030-6242-4279-9e5a-a055eeb8d8d9"
name: ""
passthrough:
connection.timestamp: "1705184110"
wifi-security.auth-alg: "open"
ipv6.ip6-privacy: "-1"
proxy._: ""
networkmanager:
uuid: "32c63030-6242-4279-9e5a-a055eeb8d8d9"
name: ""
network:
version: 2
wifis:
NM-89d0b746-b032-4da0-924f-55ce8ad62274:
renderer: NetworkManager
match:
name: ""
dhcp4: true
dhcp6: true
ipv6-address-generation: "stable-privacy"
access-points:
"":
auth:
key-management: "psk"
password: ""
networkmanager:
uuid: "89d0b746-b032-4da0-924f-55ce8ad62274"
name: ""
passthrough:
connection.timestamp: "1710898792"
wifi-security.auth-alg: "open"
ipv6.ip6-privacy: "-1"
proxy._: ""
networkmanager:
uuid: "89d0b746-b032-4da0-924f-55ce8ad62274"
name: ""
network:
version: 2
wifis:
NM-8d26504f-2bd6-4d6a-ad06-0969c5838eb6:
renderer: NetworkManager
match:
name: ""
dhcp4: true
dhcp6: true
ipv6-address-generation: "stable-privacy"
access-points:
"":
auth:
key-management: "psk"
password: ""
networkmanager:
uuid: "8d26504f-2bd6-4d6a-ad06-0969c5838eb6"
name: ""
passthrough:
connection.timestamp: "1704069031"
wifi-security.auth-alg: "open"
ipv6.ip6-privacy: "-1"
proxy._: ""
networkmanager:
uuid: "8d26504f-2bd6-4d6a-ad06-0969c5838eb6"
name: ""
出于安全原因，我删除了一些 wifi 信息。
答案1
它应该是/run/systemd/resolve/stub-resolv.conf而不是../run/systemd/resolve/stub-resolv.conf。
另外，考虑一种新的 systemd 方法，向 systemd-resolved 提供额外的 DNS 信息，而不是stub-resolv.conf直接编辑：https://www.freedesktop.org/software/systemd/man/latest/resolved.conf.html
TL;DR 您可以添加一个新的 conf 文件，
/etc/systemd/resolved.conf.d/<some name>.conf
内容如下
[Resolve]
DNS=8.8.8.8
答案2
通常，最好不要在 8 月份发布第一个版本 24.0.1 之前升级。升级后，我听说您遇到了一个问题，即sysyemd-resolved删除了哪些内容。
因此，要解决您的问题，请使用以下命令进行安装：
sudo apt install systemd-resolved
这将重新安装解析器并解决您的问题。