Ubuntu 22.04 to Ubuntu 24.04 Unable to ping

[phenomlab]

@abcabc123 For years it’s been simple to set up DNS on a Linux machine. You’d usually just add a couple of entries to /etc/resolv.conf and you’re done.

# Use Google's public DNS servers.
nameserver 8.8.4.4
nameserver 8.8.8.8

But things change and now it’s not that simple. If you now edit /etc/resolv.conf on Ubuntu you’ll find that the edits are ephemeral. If you restart (or even hibernate) your machine then they’ll be overwritten by default content.

nameserver 127.0.0.53
search Home

This is pretty simple to fix though.

Install the resolvconf package.

sudo apt install resolvconf

Edit /etc/resolvconf/resolv.conf.d/head and add the following:

#Make edits to /etc/resolvconf/resolv.conf.d/head.
nameserver 8.8.4.4
nameserver 8.8.8.8

Save the changes and restart the systemd-resolved service as shown.

sudo systemctl restart systemd-resolved.service

It’s also prudent to check the status of the resolver and ensure that it is active and running as expected:

sudo systemctl status systemd-resolved.service

Then try pinging any website and the issue should be resolved even post reboot.

[abcabc123]

I won’t get it, can you help me with the installation

[phenomlab]

@abcabc123 You just need to follow the steps I posted.

[abcabc123]

I won’t install resolvconf and won’t configure

[abcabc123]

I don’t even know how to find it, how to open the /etc/resolv.conf file

[phenomlab]

@abcabc123 said in Ubuntu 22.04 to Ubuntu 24.04 Unable to ping:

I won’t install resolvconf and won’t configure

You mean you won’t complete the steps? If you don’t, then how to you expect to resolve the issue? If you follow the steps I posted (you can copy and paste) then this will fix the issue.

[abcabc123]

I copied and pasted in and it showed that the command didn’t exist

[phenomlab]

@abcabc123 It does - you start with

sudo apt install resolvconf

[abcabc123]

Tossed for 24 hours, it still hasn’t been resolved, and the file can’t be saved.

[phenomlab]

@abcabc123 are you using sudo to open the file? For example, sudo nano /etc/resolvconf/resolv.conf.d/head

[abcabc123]

[abcabc123]

This post is deleted!

[abcabc123]

[abcabc123]

[phenomlab]

@abcabc123 Hmm - ok. Let’s try this instead

To set a permanent DNS on the latest version of Ubuntu (e.g., Ubuntu 22.04 or later), you typically configure DNS settings via Netplan, the network configuration tool. Here’s how you can do it:

---

1. Locate the Netplan Configuration File

Netplan configuration files are located in the /etc/netplan/ directory. Typically, the file is named something like 01-netcfg.yaml or 50-cloud-init.yaml. Use the following command to list the files:

ls /etc/netplan/

---

2. Edit the Configuration File

Open the appropriate Netplan file for editing. For example:

sudo nano /etc/netplan/01-netcfg.yaml

---

3. Modify the DNS Configuration

Add or modify the nameservers section under the relevant interface. Your file might look like this:

network:
  version: 2
  ethernets:
    enp0s3:  # Replace with your network interface name
      addresses:
        - 192.168.1.100/24  # Your static IP address (if applicable)
      gateway4: 192.168.1.1 # Your gateway address
      nameservers:
        addresses:
          - 8.8.8.8    # Primary DNS
          - 8.8.4.4    # Secondary DNS

• Replace enp0s3 with your actual network interface name, which you can find using:

  ip a
  

• Adjust the DNS servers (8.8.8.8, 8.8.4.4) to your preference.

---

4. Apply the Configuration

Save the file and apply the changes:

sudo netplan apply

---

5. Verify the DNS Configuration

Confirm that the DNS settings are applied:

systemd-resolve --status

Look for the DNS Servers under your active interface.

---

Additional Notes:

• If you use NetworkManager (common on desktop installations), you can configure DNS through the GUI or by editing /etc/NetworkManager/NetworkManager.conf.

• If your system uses systemd-resolved, ensure it’s enabled and running:

  sudo systemctl enable systemd-resolved
  sudo systemctl start systemd-resolved

This setup ensures the DNS settings persist across reboots. Let me know if you run into any issues!

[abcabc123]

Is that right?

[phenomlab]

@abcabc123 Looks correct, yes.

[abcabc123]

It’s too complicated, I’m new to linux

[abcabc123]

Ubuntu 22.04 operating system Can you install nodebb forum

[abcabc123]

What operating system, install nodebb forum is the best