Comment 3 for bug 1841619

This is a real BUG fixed in 0.6.2-2.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=934039

It impact any fresh install of 18.04, trying to run dehydrated as well:
Same error as Debian Bug report logs - #934039

On Ubuntu 18.04 dehydrated is stuck in version 0.6.1-2
Let's encrypt production API was changed in August 2019 (before the issue was only on the Staging Environment API).

Here is the version used in Debian:
Package dehydrated

    stretch (oldstable) (misc): ACME client implemented in Bash
    0.3.1-3+deb9u2: all
    stretch-backports (misc): ACME client implemented in Bash
    0.6.2-2~bpo9+1: all
    buster (stable) (misc): ACME client implemented in Bash
    0.6.2-2+deb10u1: all
    buster-backports (misc): ACME client implemented in Bash
    0.6.5-1~bpo10+1: all
    bullseye (testing) (misc): ACME client implemented in Bash
    0.6.5-1: all
    sid (unstable) (misc): ACME client implemented in Bash
    0.6.5-1: all