Restore Default Ubuntu 22.04 DNS Settings

nightwatch

6/22/24, 6:33 AM

Situation
Prior, to properly backing up my freshly installed Ubuntu 22.04 with Timeshift... I attempted to instead install dsnmasq for local web development. Of course, I broke my DNS and now my fresh install has no internet access :-(

Error
These are the exact step from my personal notes that caused the error:

1. Disable & stop systemd resolved  

    $ sudo systemctl disable systemd-resolved  
    $ sudo systemctl stop systemd-resolved

2. Remove symlink on `/etc/resolv.conf` & remove the file

    $ ls -lh /etc/resolv.conf  
    $ sudo rm /etc/resolv.conf

3. create new /etc/resolv.conf
   
   sudo bash -c 'echo "nameserver 127.0.0.1" > /etc/resolv.conf'

After item 3.) above, I completely lost internet access.

Troubleshooting

1.) I easily re-enabled systemd-resolved

Update: @keff suggested solution below, seems to be correct, but it does not work.

1.) I created a virtualbox installation of ubuntu 22.04 and made a copy of /etc/resolv.conf that I put in my shared folder and took a screenshot of the ls -l /etc/resolv.conf output.

2.) I followed @keff's instructions and compared the results to my virtualbox output... they match. I rebooted the machine to ensure all possible services get a restart.

DNS just isn't working, although it is correctly configured. I have two laptops connected to the same wifi connection, so I know the wifi is working correctly.

I am stumped.

(yes, port 53 is open in ufw)

Question The part of my foolery that eludes me is, "How do I re-establish the /etc/resolv.conf symlink, so that box once again has outside internet access?"

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