Not sure if this helps, but I had DNS issues after upgrading to 22.04. I fixed the issue with the following two commands:
$ sudo rm -f /etc/resolv.conf
$ sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
More explanation can be found [here.](https://ubuntu-mate.community/t/upgrade-to-22-04-broke-dns/26205)