manpages binary package in Ubuntu Focal amd64

 This package contains GNU/Linux manual pages for these sections:
  4 = Devices (e.g. hd, sd).
  5 = File formats and protocols, syntaxes of several system
      files (e.g. wtmp, /etc/passwd, nfs).
  7 = Conventions and standards, macro packages, etc.
      (e.g. nroff, ascii).
 .
 Sections 1, 6 and 8 are provided by the respective applications. This
 package only includes the intro man page describing the section.
 .
 The man pages describe syntaxes of several system files.

Source package