DNS resolver stopped working after upgrade to 20.04

I just installed Ubuntu 20.04, and had to remove netplan (I have my reasons). I then had a name resolution problem to solve. Here's how I fixed it:

Edit /etc/systemd/resolved.conf and change/add this line:

DNS=1.1.1.1

(I'm using CloudFlare's DNS server here.)

Then change the /etc/resolv.conf symlink like this:

sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf

Last, reboot. I hope this helps!