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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$ dpkg -S `which wall`
bsdutils: /usr/bin/wall

Ubuntu 20.04.6 LTSではlinux-utilsじゃなくてbsdutilsに入ってるぬ…

zunda

Ubuntu 22.04.4 LTSでもおなじ。記事が間違ってるのかしら。