AWS Amazon

Create EC2 Instance with Ubuntu Server (choose defaulf security group)

Generate Key Par and download the file

Open "Security Groups", select "default" group, choose SSH rule and add the source "0.0.0.0/0" (press Add rule and Apply rule changes)

Open SSH Client (SSH Cliente for Ubuntu or Putty for Windows)

Set special permission on file
    chmod 400 yourkeypar.pem

Execute in the SSH
ssh -i yourkeypar.pem ubuntu@ec2-23-21-14-115.compute-1.amazonaws.com

where:
ubuntu: user
ec2-23-21-14-115.compute-1.amazonaws.com: is your public DNS(EC2)
yourkeypar.pem: your key par