The requested nginx plugin does not appear to be installed

NGINXでCertbotを使用するときに、

エラーが発生した時のメモ。

エラー内容

The requested nginx plugin does not appear to be installed

のエラーが発生

状況確認

コマンド

certbot --version

確認結果

$ certbot --version
command not found: cerbot

対応内容

コマンド

sudo apt install python3-certbot-nginx

対応結果

$ sudo apt install python3-certbot-nginx
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  jsonlint libllvm11 libxdamage1 linux-headers-5.4.0-77 linux-headers-5.4.0-77-generic
  linux-image-5.4.0-77-generic linux-modules-5.4.0-77-generic php-composer-ca-bundle
  php-composer-semver php-composer-spdx-licenses php-composer-xdebug-handler php-json-schema
  php-psr-container php-psr-log php-symfony-console php-symfony-filesystem php-symfony-finder
  php-symfony-process php-symfony-service-contracts ssl-cert unzip
Use 'sudo apt autoremove' to remove them.
Suggested packages:
  python-certbot-nginx-doc
The following NEW packages will be installed:
  python3-certbot-nginx
0 upgraded, 1 newly installed, 0 to remove and 71 not upgraded.
Need to get 50.8 kB of archives.
After this operation, 286 kB of additional disk space will be used.
Get:1 http://mirrors.digitalocean.com/ubuntu focal-updates/universe amd64 python3-certbot-nginx all 0.40.0-0ubuntu0.1 [50.8 kB]
Fetched 50.8 kB in 0s (1,013 kB/s)
Selecting previously unselected package python3-certbot-nginx.
(Reading database ... 147990 files and directories currently installed.)
Preparing to unpack .../python3-certbot-nginx_0.40.0-0ubuntu0.1_all.deb ...
Unpacking python3-certbot-nginx (0.40.0-0ubuntu0.1) ...
Setting up python3-certbot-nginx (0.40.0-0ubuntu0.1) ...