Ubuntu 18.04 sudo apt update doesn't work (Failed to Fetch)

Question

I have tried quite many solution to this like prioritizing IPv4 and disabling IPv6 or adding Google DNS server, fix the sources list and some other suggestion on AskUbuntu but nothing worked.

I have also tried with different wifi networks (I can get no access to LAN unfortunately since I am living in a dorm and work in a common workspace with organization internet).

Another thing is that I cannot ping also.

I am quite new to Ubuntu so if anyone can help me I would be really grateful. When I enter sudo apt update the output is this :

Err:1 http://archive.getdeb.net/ubuntu xenial-getdeb InRelease        
  Temporary failure resolving 'archive.getdeb.net'
Err:2 http://packages.ros.org/ros/ubuntu bionic InRelease             
  Temporary failure resolving 'packages.ros.org'
Reading package lists... Done      
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://archive.getdeb.net/ubuntu/dists/xenial-getdeb/InRelease  Temporary failure resolving 'archive.getdeb.net'
W: Failed to fetch http://packages.ros.org/ros/ubuntu/dists/bionic/InRelease  Temporary failure resolving 'packages.ros.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.

Ubuntu 18.04 sudo apt update doesn't work (Failed to Fetch)

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