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Asked: 2024-09-24T11:55:10+05:30 In:

I’m experiencing an issue with Ubuntu 20.04 where my wired internet connection is showing a temporary failure in name resolution. Can anyone provide guidance on how to resolve this problem?

I’ve been diving into the world of Ubuntu 20.04, and I’m running into a pretty frustrating issue with my wired internet connection. Everything was working fine until just a few days ago when I suddenly started getting this message about a temporary failure in name resolution. It’s like my internet connection has decided to become a rebellious teenager overnight!

At first, I thought it was just a one-off thing, so I restarted my router, checked the cables, and even rebooted my laptop. But nope, still no luck. I can connect to the network just fine—it’s showing I’m connected, but as soon as I try to access any website, it just won’t resolve the domain names. I feel like I’m staring at a blank page when I should be diving into the depths of the internet.

I’ve poked around some forums but it feels like there are a million potential solutions out there, and I’m not exactly a networking expert. I’ve tried flushing my DNS cache using the `sudo systemd-resolve –flush-caches` command. I reset the network settings and even played with the `/etc/resolv.conf` file, but nothing seems to stick.

I suspect it might be something to do with the DNS settings since everything else appears to work. I tried switching to Google’s DNS servers (8.8.8.8 and 8.8.4.4), but I’m still getting this irritating temporary failure message.

It’s worth mentioning that other devices on the same network are working fine—like my phone and a Windows laptop, so I’m leaning toward something quirky with my Ubuntu setup rather than a broader network issue. I’ve also checked for updates since I’ve heard that sometimes bugs in older versions can mess things up, but I’m up-to-date!

Has anyone else faced this kind of problem? Seriously, any input or trick you can share would be a lifesaver right now. I’m starting to think maybe I’m just not meant to have a smooth online experience! Thanks in advance for any help you can throw my way.

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    2 Answers


    1. The issue you’re facing with the “temporary failure in name resolution” error on Ubuntu 20.04 suggests a DNS-related problem, especially since other devices on your network are connecting without any issues. Since you’ve already tried flushing the DNS cache and modifying the `/etc/resolv.conf` file, let’s ensure that your DNS settings are properly configured. First, try checking your network settings to confirm that your Ethernet connection is set to use the correct DNS servers. You can do this by accessing the network settings from the system tray or by using the command line. Add Google’s DNS servers directly to `/etc/resolv.conf` by ensuring the file includes the lines: nameserver 8.8.8.8 and nameserver 8.8.4.4. Just remember that modifications to this file may not persist after a reboot unless you configure your network manager settings accordingly.

      If that doesn’t resolve the issue, I recommend looking into whether the NetworkManager service is properly managing your DNS settings. You can restart it with sudo systemctl restart NetworkManager. Additionally, make sure that the `systemd-resolved` service is enabled and running. Use sudo systemctl status systemd-resolved to check its status and sudo systemctl start systemd-resolved to start it if it’s not running. In case it still doesn’t work, consider temporarily disabling systemd’s DNS management by stopping the `systemd-resolved` service and manually setting your DNS servers in the NetworkManager interface. Lastly, if you’re using a VPN or firewall, examine their settings as they might be interfering with your DNS queries. These steps should help you regain access to the vast seas of the internet!


    2. Sounds like you’re having a rough time with your internet connection on Ubuntu 20.04! That can be super frustrating, especially when everything was working fine before. Here are a few things you might want to check:

      • Double-check DNS Settings: Since you mentioned trying Google’s DNS, make sure you added them correctly. You can do this by editing your /etc/resolv.conf file. You can add the following lines:
        • nameserver 8.8.8.8
nameserver 8.8.4.4
      • Restart the Network Manager: Sometimes restarting Network Manager can help clear up these issues. You can do that by running:
        • sudo systemctl restart NetworkManager
      • Check Your Firewall: Maybe something in your firewall settings is blocking your DNS requests? You could try temporarily disabling the firewall to see if it makes a difference. You can disable it with:
        • sudo ufw disable
      • Use a Different Connection Method: If you’re using a wired connection, see if you can connect via Wi-Fi or vice versa. This might help you isolate the issue further.
      • Look for Driver Issues: Sometimes the drivers for your network hardware can act funky. You might want to check if you’re using the latest drivers for your network card.
      • Consider the MTU Setting: There are times when setting the MTU (Maximum Transmission Unit) to a lower value can help with connectivity issues. You can change it with:
        • sudo ifconfig your_interface_name mtu 1400

        (Replace your_interface_name with the name of your network interface, like eth0 or enp3s0).

      Given that it’s only happening on Ubuntu and not on your other devices, it does seem like a quirky setup issue. Hope one of these suggestions helps get you back online! Good luck!

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