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I am running Ubuntu 18.04. I am able able to connect my laptop to all networks except my university wifi which requires authentication. Instead of the wifi login page, I get a page saying "Error resolving “nmcheck.gnome.org”: Name or service not known". I have tried all the solutions mentioned in this link https://askubuntu.com/questions/826998/cannot-log-in-to-public-open-wifi-connection and I also reinstalled gnome but the problem still persists.

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2 Answers 2

Reset to default
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The problem was with docker. I stopped all running docker containers and deleted their images and then it worked fine.

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  • 1
    I used docker system prune to fix mine, but I wonder if docker network prune might have been enough.
    – itzg
    Commented Nov 3, 2020 at 2:07
  • 2
    docker network prune worked for me
    – ATN
    Commented Nov 29, 2020 at 15:48
  • docker network prune is the key
    – MCMZL
    Commented Apr 5, 2023 at 5:41
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I had the same problem at a starbucks but killing docker stuff (which I was indeed using) wasn't the solution. I followed the answers here, most notably,

  1. After getting the "Error resolving “nmcheck.gnome.org”: Name or service not known", run route -n in terminal to see the routing table
  2. Type the default Gateway (entry to right of 0.0.0.0 for me) into your browser's address bar, which took me to the starbucks login page. After that everything worked fine.

It does smell like a DNS issue but manually setting dns didn't work for me, and before I got to the login page, attempts to e.g. ping 8.8.8.8 resulted in packets getting filtered.

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