Ubuntu installation and configuration:
1. Install Ubuntu from CD image
2. Set the network interface to share with Minix machine:
   VMware: Set Network Interface to NAT
   VirtualBox: Set Network Interface to Nat network -> natnet1
3. Run Ubuntu
4. Set a static IP address 192.168.43.17, netmask 255.255.255.0, gateway 192.168.43.2 inside Ubuntu
5. Reboot
6. Install: sudo apt install rsh-client filezilla
7. Add to /etc/ssh/ssh_config:
  Host 192.168.43.16
      KexAlgorithms diffie-hellman-group1-sha1
      HostKeyAlgorithms ssh-dss
      Ciphers 3des-cbc
  Host minix
      KexAlgorithms diffie-hellman-group1-sha1
      HostKeyAlgorithms ssh-dss
      Ciphers 3des-cbc
8. Add to /etc/hosts:
  192.168.43.16 minix
9. Rsh and ssh to Minix should work:
  ssh root@minix
  rsh root@minix

Optionally You can also set rsh and ssh server on Ubuntu for Minix to connect to.
9. Install: sudo apt install rsh-server openssh-server
10. ssh-keygen -t dsa
11. Add to /etc/ssh/sshd_config:
  HostKey /home/user/.ssh/id_dsa
  KexAlgorithms diffie-hellman-group1-sha1
  HostKeyAlgorithms ssh-dss
  Ciphers 3des-cbc