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Kubuntu 18.4 CLI 上出现间歇性网络错误

tag-icon • tag-icon command-line networking kubuntu
Kubuntu 18.4 CLI 上出现间歇性网络错误

升级到 Kubuntu 18.4 后，我在 git 或 ping 等命令行程序中遇到网络故障。

升级过程挂起了，我不得不重新启动笔记本电脑，但重新启动后，除了这一点之外，一切看起来都很好。

错误仅在 CLI 程序中可见。桌面程序似乎运行良好。

sebas@sebas-HP:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic
sebas@sebas-HP:~$ 
sebas@sebas-HP:~$ ping google.com
connect: the network is unreachable
sebas@sebas-HP:~$ ping google.com                                                                                                                                                            ⏎
PING google.com (172.217.28.174) 56(84) bytes of data.
64 bytes from eze03s29-in-f14.1e100.net (172.217.28.174): icmp_seq=1 ttl=54 time=9.19 ms
64 bytes from eze03s29-in-f14.1e100.net (172.217.28.174): icmp_seq=2 ttl=54 time=10.0 ms
^C
--- google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 9.199/9.634/10.069/0.435 ms
sebas@sebas-HP:~$ ping google.com
connect: the network is unreachable
sebas@sebas-HP:~$ ping google.com                                                                                                                                                            ⏎
PING google.com (172.217.28.174) 56(84) bytes of data.
64 bytes from eze03s29-in-f14.1e100.net (172.217.28.174): icmp_seq=1 ttl=54 time=17.4 ms
^C
--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 17.406/17.406/17.406/0.000 ms
sebas@sebas-HP:~$ ping google.com
connect: the network is unreachable
sebas@sebas-HP:~$ ping google.com                                                                                                                                                            ⏎
PING google.com (172.217.28.174) 56(84) bytes of data.
64 bytes from eze03s29-in-f14.1e100.net (172.217.28.174): icmp_seq=1 ttl=54 time=9.34 ms
^C
--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 9.348/9.348/9.348/0.000 ms
sebas@sebas-HP:~$ ping google.com
PING google.com (172.217.28.174) 56(84) bytes of data.
64 bytes from eze03s29-in-f14.1e100.net (172.217.28.174): icmp_seq=1 ttl=54 time=15.1 ms
64 bytes from eze03s29-in-f14.1e100.net (172.217.28.174): icmp_seq=2 ttl=54 time=10.0 ms
^C
--- google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 10.032/12.577/15.122/2.545 ms
sebas@sebas-HP:~$ ping google.com
connect: the network is unreachable
sebas@sebas-HP:~$ ping google.com                                                                                                                                                            ⏎
PING google.com (172.217.28.174) 56(84) bytes of data.
64 bytes from eze03s29-in-f14.1e100.net (172.217.28.174): icmp_seq=1 ttl=54 time=11.1 ms
^C
--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 11.169/11.169/11.169/0.000 ms
sebas@sebas-HP:~$ ping google.com
connect: the network is unreachable

有没有什么地方可以查找我可能遇到的错误配置？

答案1

我尝试了 user535733 建议的方法并进行了检查/var/log/syslog。我发现了错误：

Dec 25 22:30:54 sebas-HP systemd-resolved[724]: Failed to open /etc/hosts: Permission denied
Dec 25 22:30:54 sebas-HP systemd-resolved[724]: Failed to start query: Permission denied

事情是这样的，我将 /etc/hosts 作为符号链接指向我常规用户主目录中的一个文件（因为我想在 git 中进行版本控制）。

$ ls -la | grep hosts
lrwxrwxrwx   1 root  root       25 abr 26  2016 hosts -> /home/sebas/doc/prj/hosts

在我的 prj 文件夹中：

$ ls -la | grep hosts
-rwxr--r--    1 sebas sebas      1758 oct 31  2017 hosts

不确定是符号链接还是权限导致了问题，但在上次系统升级之前从未失败过。

无论如何，将 /etc/hosts 恢复为常规文件可以解决问题。

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