Creating a virtual machine (ubuntu) with virtual box

Yesterday, I created a virtual machine for ubuntu system using VirtualBox.

1. Download the iso file of the operating system:
   
2. Open VirtualBox, then choose the corresponding operating system:
   
3. Mount the iso file on VirtualBox:
   
4. Format the disk space.
5. Complete the regular settings.
6. Set network adapters:
   _ there can be multiple adapters
   _ For my virtual machine, one adapter is used for NAT, the other one is used to connect to the host through ssh
   
7. remotely connect to the virtual machine through ssh:
   On host system, search for folder .ssh . There should be a public key id_rsa.pub .
   Then open it either using

   cat id_rsa.pub

   or

   vim id_rsa.pub

   Switch to the virtual machine, again, find .ssh folder and open it with

   vim authorized_keys

   and paste the public key to the file, then save and close the file with

   :wq [ENTER]

8. Use

   ip a

   to chech the ip address of the virtual machine, and connect to the virtual machine through ssh remotely.