I installed VirtualBox and Ubuntu on my Mac because I wanted to study Linux and the environment. I would like to keep it as my memorandum.
--Download VirtualBox platform pagkages (select OS X)
--Download VM VirtualBox Extension Pack (select All supported platforms)
--Install the downloaded platform package. --Install the downloaded VM VirtualBox Extension Pack.
--Click ubuntu-ja-18.04.3-desktop-amd64.iso (ISO image) to download
--Set the name and disguise computer name on the operating system screen and click "Continue"
--Specify memory size (4096MB or more is preferable)
--Select "Create Virtual Hard Disk" on the hard disk screen and click the Create button.
--Select VDI on the hard disk file type screen and click "Continue"
--Specify the size on the storage screen on the physical hard disk (select variable size this time)
--Set the size on the file location and size screen (minimum 16GB, if you want to use it in normal operation, want about 100GB) and click "Create"
--Select "Empty", click the disk mark, and select "ubuntu-ja-18.04.2-desktop-amd64.iso". Then click "OK"
--Click the "Start" button to start the installation
--Click "Install Ubuntu"
--Select "Japanese" on the keyboard layout page
--On the Updates and Other Software screens, select "Install graphics and wi-Fi hardware and third-party software in additional media formats"
--On the installation type screen, select "Remove disk and install Ubuntu" and click "Install".
--Select "ubuntu-ja-18.04.2-desktop-amd64.iso" on the screen for selecting the boot hard disk, and click "Boot".
--You will be asked "Do you want to write your changes to disk?", So click "Continue".
――You will be asked "Where do you live?", So select "Tokyo" and click "Continue".
--On the "Enter your information" screen, set your name, computer name, user name and password, and click "Continue".
--On the installation completion screen, click "Restart Now"![Qiita_ubuntu24.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/510569/fac84191- c739-df33-12cd-5d7cbb4faebe.png)
--Controller: Remove "ubuntu-ja-18.04.3-desktop-amd64.iso" from the IDE, close the screen with the OK button, then click "Enter"
--Return to the top screen and click on the account created.
--Enter the password you set earlier and click "Sign in"
--Go to activity, search for "terminal" in the search bar and go to terminal.