mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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YubiKeyにOpenPGP鍵を生成させることはできそうだけれどgpg --card-editが動く必要があるのわね
https://support.yubico.com/hc/en-us/articles/360013790259-Using-Your-YubiKey-with-OpenPGP

zunda

$ gpg --card-edit

gpg: error getting version from 'scdaemon': No SmartCard daemon
gpg: OpenPGP card not available: No SmartCard daemon

gpg/card>

追加のパッケージ必要ね…