My operating system is (include version):

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal

I installed Certbot with (certbot-auto, OS package manager, pip, etc):

Certbot

• sudo apt install -y certbot
• sudo apt install -y python3-certbot-nginx

I ran this command and it produced this output:

sudo certbot

Certbot's behavior differed from what I expected because:

Newer OS server and believe not completely ready

Here is a Certbot log showing the issue (if available):

Logs are stored in /var/log/letsencrypt by default. Feel free to redact domains, e-mail and IP addresses as you see fit.

2020-04-25 01:25:07,145:DEBUG:urllib3.connectionpool:https://acme-v02.api.letse>
2020-04-25 01:25:07,146:DEBUG:acme.client:Received response:
HTTP 200
Server: nginx
Date: Sat, 25 Apr 2020 01:25:05 GMT
Content-Type: application/json
Content-Length: 797
Connection: keep-alive
Boulder-Requester: 84386859
Cache-Control: public, max-age=0, no-cache
Link: https://acme-v02.api.letsencrypt.org/directory;rel="index"
Replay-Nonce: 0001vLE1npPpRv6CrnqfpVlL8VGaAtZa7HUp8ppzNBnDMPo
X-Frame-Options: DENY
Strict-Transport-Security: max-age=604800

{
"identifier": {
"type": "dns",
"value": "isme.twinklebbs.xyz"
},
"status": "pending",
"expires": "2020-05-02T00:43:32Z",
"challenges": [
{
"type": "http-01",
"status": "pending",
"url": "https://acme-v02.api.letsencrypt.org/acme/chall-v3/4162688563/ZQs>
"token": "_iKdhhYmc0P5WaoKgKU1xQDQmHlejx0zMRV_eY0HzUE"
},
{
"type": "dns-01",
"status": "pending",
"url": "https://acme-v02.api.letsencrypt.org/acme/chall-v3/4162688563/dtD>
"token": "_iKdhhYmc0P5WaoKgKU1xQDQmHlejx0zMRV_eY0HzUE"
},
{
"type": "tls-alpn-01",
"status": "pending",
"url": "https://acme-v02.api.letsencrypt.org/acme/chall-v3/4162688563/nnp>
"token": "iKdhhYmc0P5WaoKgKU1xQDQmHlejx0zMRV_eY0HzUE"
}
]
}
2020-04-25 01:25:07,146:DEBUG:acme.client:Storing nonce: 0001vLE1npPpRv6CrnqfpV>
2020-04-25 01:25:07,147:INFO:certbot.auth_handler:Performing the following chal>
2020-04-25 01:25:07,147:DEBUG:certbot.log:Exiting abnormally:
Traceback (most recent call last):
File "/usr/bin/certbot", line 11, in
load_entry_point('certbot==0.40.0', 'console_scripts', 'certbot')()
File "/usr/lib/python3/dist-packages/certbot/main.py", line 1382, in main
return config.func(config, plugins)
File "/usr/lib/python3/dist-packages/certbot/main.py", line 1132, in run
new_lineage = get_and_save_cert(le_client, config, domains,
File "/usr/lib/python3/dist-packages/certbot/main.py", line 121, in get_and>
lineage = le_client.obtain_and_enroll_certificate(domains, certname)
File "/usr/lib/python3/dist-packages/certbot/client.py", line 417, in obtain>
cert, chain, key, _ = self.obtain_certificate(domains)
File "/usr/lib/python3/dist-packages/certbot/client.py", line 348, in obtain>
orderr = self._get_order_and_authorizations(csr.data, self.config.allow_sub>
File "/usr/lib/python3/dist-packages/certbot/client.py", line 396, in _get_or>
authzr = self.auth_handler.handle_authorizations(orderr, best_effort)
File "/usr/lib/python3/dist-packages/certbot/auth_handler.py", line 62, in ha>
achalls = self._choose_challenges(authzrs)
File "/usr/lib/python3/dist-packages/certbot/auth_handler.py", line 206, in _>
self._get_chall_pref(authzr.body.identifier.value),
File "/usr/lib/python3/dist-packages/certbot/auth_handler.py", line 221, in _>
plugin_pref = self.auth.get_chall_pref(domain)
File "/usr/lib/python3/dist-packages/certbot_nginx/configurator.py", line 111>
return [challenges.HTTP01, challenges.TLSSNI01]
AttributeError: module 'acme.challenges' has no attribute 'TLSSNI01'
2020-04-25 01:25:07,151:ERROR:certbot.log:An unexpected error occurred:

Here is the relevant nginx server block or Apache virtualhost for the domain I am configuring:

Performing the following challenges:
An unexpected error occurred:
AttributeError: module 'acme.challenges' has no attribute 'TLSSNI01'
Please see the logfiles in /var/log/letsencrypt for more details.

This ran without any hitch before

server {
listen 80;
listen [::]:80;

root /var/www/isme;

index index.php;
server_name isme.twinklebbs.xyz;

location / {
autoindex on;
try_files $uri $uri/ =404;
}

location ~ .php$ {
include snippets/fastcgi-php.conf;
fastcgi_pass unix:/run/php/php7.2-fpm.sock;
}

location ~* .(jpg|jpeg|png|gif|ico|css|js)$ {
expires 365d;
}

location ~ /.ht {
deny all;
}
}