Ah, I notice that /usr/bin/mail is a symlink:
$ ll /usr/bin/mail
lrwxrwxrwx 1 root root 22 Aug 31 16:55 /usr/bin/mail ->
/etc/alternatives/mail
and its target is also a symlink:
$ ll /etc/alternatives/mail
lrwxrwxrwx 1 root root 23 Aug 31 16:55 /etc/alternatives/mail ->
/usr/bin/mail.mailutils
and the ultimate target is in a package:
$ apt-file search /usr/bin/mail.mailutils
mailutils: /usr/bin/mail.mailutils
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https://bugs.launchpad.net/bugs/1222179
Title:
/usr/bin/mail has no package
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