configure suggests to install openssh and openssh-client.

0 jan@muizenberg:/srv/sage-9.7$grep openssh src/doc/en/installation/debian-develop.txt.orig
  $ sudo apt-get install  autoconf automake git gpgconf libtool openssh openssh-client pkg-config

There is no package called openssh:
https://packages.debian.org/search?keywords=openssh&searchon=names&exact=1&suite=all&section=all
https://packages.ubuntu.com/search?keywords=openssh&searchon=names&exact=1&suite=all&section=all

End-users often copy and paste this line, often not even reading the error or realising the command failed.

There is a meta-package called ssh depending on openssh-client and openssh-server, but we should not be advocating ssh server installations on laptops which often have terrible passwords, such as containing or equal to the username, or very poor passwords like 1234 or password. Yes, my students still do this.

0 jan@muizenberg:/srv/sage-9.7$apt depends ssh
ssh
  PreDepends: dpkg (>= 1.17.5)
    dpkg:i386
  Depends: openssh-client (>= 1:8.4p1-5+deb11u1)
    openssh-client:i386
  Depends: openssh-server (>= 1:8.4p1-5+deb11u1)
    openssh-server:i386

Attached patch to remove "openssh" from the instructions for debian, but keeping openssh-client.

Note I do not know whether a package called openssh exists for the other distros/platforms:

0 jan@muizenberg:/srv/sage-9.7$ls src/doc/en/installation/*-develop.txt
src/doc/en/installation/arch-develop.txt    src/doc/en/installation/debian-develop.txt  src/doc/en/installation/homebrew-develop.txt
src/doc/en/installation/cygwin-develop.txt  src/doc/en/installation/fedora-develop.txt  src/doc/en/installation/opensuse-develop.txt

Component: documentation

Author: Jan Groenewald

Branch/Commit: 2de6d46

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/34561