This guide will allow you to set custom DNS to help with networking issues.

Commands To Run

Below is a block of code which will install OpenSSL and add the following DNS servers, 8.8.8.8 and 1.1.1.1 but these could be replaced with any DNS you would like to use.

steps:
    - run: sudo apt-get update
    - run: sudo apt-get install openssl
    - run: sudo sed -i '13 i \ \ \ \ \ \ \ \ \ \ \ \ nameservers:' /etc/netplan/50-cloud-init.yaml
    - run: sudo sed -i '14 i \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ addresses:' /etc/netplan/50-cloud-init.yaml
    - run: sudo sed -i "s/addresses:/ addresses":" [8.8.8.8, 1.1.1.1] /g" /etc/netplan/50-cloud-init.yaml
    - run: cat /etc/netplan/50-cloud-init.yaml
    - run: sudo netplan apply

NOTE: When setting this the original DNS server will also be set so you will have three DNS servers defined that can be used.