how to install ubuntu 18.04 LTS in Oracle VirtualBox

Step 1: Click on New icon

Step 2: Type "ubuntu" and click on [Next]

Step 3: Select RAM size and click on [Next]

Step 4: Add a Virtual hard disk to a new machine from selecting the listed options

Step 5: Choose the hard disk file type as "VDI" from the options and click on [Next]

Step 6: Select the Storage on the physical hard disk as "Dynamically Allocated" and click on [Next]

Step 7:  Select the Hard disk size and click on [Create]

Step 8: Click on "ubuntu" on the left pane or click on "Start" ==> "Normal"

                                                                     or
Step 8.1 Right-click on "ubuntu" and select "Start" then click on "Normal"

Step 9: Select "ubuntu" iso image from the folder and click on [Open]

Step 9.1: Click on [Start]

Step 10: Select & click on  "Install Ubuntu"

Step 11: Select preferred language and click on [Continue]

Step 12: Select the "Noram Installation" and click on [Continue]

Step 13: Select "Erase disk and install Ubuntu"

Step 14: Click on [Continue]

Step 15: Select the "Time Zone" and click on [Continue]

Step 16: Provide the "Username", "Password" & "Re-Enter the password" and click on [Continue]

Step 17: Ubuntu Installation process

                                    
Step 18: Click on Restart button to enter into Ubuntu OS

Step 19: Click on [Enter] to direct the Username window

Step 20: click on [Ubuntu-Rest] or your username

Step 21:Enter password and press [Sign In] or [Enter]

Finally, Successfully completed ubuntu Installation in Oracle VirtualBox !!!