【Laravel Sail】sail upが失敗（GPG error: http://security.ubuntu.com/ubuntu hirsute-security ...）

## 起きたエラー

Laravel SailからLaravelの初期プロジェクトを作成し、開発環境を作ろうとした。
[Laravel 8.x インストール](https://readouble.com/laravel/8.x/ja/installation.html)

`curl -s "https://laravel.build/example-app" | bash`の実行後、
`./vendor/bin/sail up`を実行したら以下のエラー

```bash
W: GPG error: http://security.ubuntu.com/ubuntu hirsute-security InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://security.ubuntu.com/ubuntu hirsute-security InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu hirsute InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://archive.ubuntu.com/ubuntu hirsute InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu hirsute-updates InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://archive.ubuntu.com/ubuntu hirsute-updates InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu hirsute-backports InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://archive.ubuntu.com/ubuntu hirsute-backports InRelease' is not signed.
ERROR: Service 'laravel.test' failed to build: The command '/bin/sh -c apt-get update     && apt-get install -y gnupg gosu curl ca-certificates zip unzip git supervisor sqlite3 libcap2-bin libpng-dev python2     && mkdir -p ~/.gnupg     && chmod 600 ~/.gnupg     && echo "disable-ipv6" >> ~/.gnupg/dirmngr.conf     && apt-key adv --homedir ~/.gnupg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys E5267A6C     && apt-key adv --homedir ~/.gnupg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys C300EE8C     && echo "deb http://ppa.launchpad.net/ondrej/php/ubuntu hirsute main" > /etc/apt/sources.list.d/ppa_ondrej_php.list     && apt-get update     && apt-get install -y php8.0-cli php8.0-dev        php8.0-pgsql php8.0-sqlite3 php8.0-gd        php8.0-curl php8.0-memcached        php8.0-imap php8.0-mysql php8.0-mbstring        php8.0-xml php8.0-zip php8.0-bcmath php8.0-soap        php8.0-intl php8.0-readline php8.0-pcov        php8.0-msgpack php8.0-igbinary php8.0-ldap        php8.0-redis php8.0-swoole php8.0-xdebug     && php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer     && curl -sL https://deb.nodesource.com/setup_16.x | bash -     && apt-get install -y nodejs     && curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -     && echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list     && apt-get update     && apt-get install -y yarn     && apt-get install -y mysql-client     && apt-get install -y postgresql-client     && apt-get -y autoremove     && apt-get clean     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*' returned a non-zero code: 100
```

## 環境
- macOS Catalina 10.15.6
- Docker version 19.03.8

## 解決策

Githubのissuesに似たようなエラー報告発見 ！！

- [Sail fresh installation is not starting and trhows errors when run sail up · Issue #190 · laravel/sail](https://github.com/laravel/sail/issues/190)
- [Laravel new project Build failed · Issue #136 · laravel/sail](https://github.com/laravel/sail/issues/136)

見る限りDockerのバージョンが問題のよう、、。

現在は `Docker version 19.03.8`

これを新しいものにアップデート！
アップデートし、`Docker version 20.10.8`になった。


再度やってみると、成功！！！