Ubuntu has changed how things have worked, and on the company network, you will need to set what DNS server is being used.
There is a settings place for this now, not tested yet:
Refer: https://vitux.com/how-to-change-dns-settings-in-ubuntu/
Refer: https://askubuntu.com/questions/1021884/no-internet-after-upgrade-from-16-04-to-18-04
Quick Test
If the /etc/resolv.conf is empty but you can ping 8.8.8.8, you can use the following as a quick test/patch, but you will need to use the following section for a complete fix.
$ echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null
Permanent Fix
HALW DNS at time of writing was: 10.211.55.1
Use the following command to determine current IP address:
$ nmcli dev show | grep 'IP4.DNS'
Ubuntu might change completely how this works in the future, you can review this article here: https://www.techrepublic.com/article/how-to-set-dns-nameservers-in-ubuntu-server-18-04/
If the /etc/resolvconf/resolv.conf.d/head is empty then you have to repeat the command above after every restart except you do this:
$ sudo apt install resolvconf
$ echo "nameserver 8.8.8.8" | sudo tee -a /etc/resolvconf/resolv.conf.d/head > /dev/null
$ echo "nameserver 10.211.55.1" | sudo tee -a /etc/resolvconf/resolv.conf.d/head > /dev/null
$ echo "nameserver 8.8.4.4" | sudo tee -a /etc/resolvconf/resolv.conf.d/head > /dev/null
Then you have to restart the resolvconf and the networking
$ sudo systemctl enable resolvconf
$ sudo systemctl start resolvconf
$ sudo /etc/init.d/networking restart
