openssh-sftp-server 1:8.4p1-6ubuntu2.1 (amd64 binary) in ubuntu impish

 This is the portable version of OpenSSH, a free implementation of
 the Secure Shell protocol as specified by the IETF secsh working
 group.
 .
 Ssh (Secure Shell) is a program for logging into a remote machine
 and for executing commands on a remote machine.
 It provides secure encrypted communications between two untrusted
 hosts over an insecure network. X11 connections and arbitrary TCP/IP
 ports can also be forwarded over the secure channel.
 It can be used to provide applications with a secure communication
 channel.
 .
 This package provides the SFTP server module for the SSH server. It
 is needed if you want to access your SSH server with SFTP. The SFTP
 server module also works with other SSH daemons like dropbear.
 .
 OpenSSH's sftp and sftp-server implement revision 3 of the SSH filexfer
 protocol described in:
 .
  http://www.openssh.com/txt/draft-ietf-secsh-filexfer-02.txt
 .
 Newer versions of the draft will not be supported, though some features
 are individually implemented as extensions.