VirtualBox

Is a Virtualization Software that can runs on MacOS, Windows, Linux clients and/or hosts.

Setup

• Nested Virtualization cannot be enabled on Windows 11 as Hyper-V is active by default

On Windows

• Change Host-Only adapter name → Windows

On Linux

• Install VirtualBox Guests Addons manually on Ubuntu
  1. sudo apt install gcc make perl
  2. Install Guest addition
     • Either autorun CD-ROM
     • Or open Terminal and run sudo ./VBoxLinuxAdditions.run
  3. Disable animations gsettings set org.gnome.desktop.interface enable-animations false
• Allow user to access Shared Folder:
  • Fix permissions with shared folders on Linux
    • Message in Ubuntu: This location could not be displayed. and You do not have the permissions necessary to view the contents of "sf_Manager".
  • Solution: sudo adduser $USER vboxsf and reboot

Data

• Compact a virtual hard drive .vdi
  1. Defragment the disk
  2. In the guest:
     • Linux: dd if=/dev/zero of=/var/tmp/bigemptyfile bs=4096k ; rm /var/tmp/bigemptyfile
     • Windows: sdelete.exe c: -z from Sysinternals
  3. Shutdown
  4. Run VBoxManage.exe modifymedium --compact c:\path\to\thedisk.vdi