Install Windows 8.1 Preview on VirtualBox

When I installed Windows 8.1 Preview on VirtualBox 4.2.14 hosted on Mac OS/X machine, I got this error:
“Your PC need to restart, Please hold down the power button Error Code : 0x000000C4”.

Here is a solution I found at https://www.virtualbox.org/ticket/10792:
Open terminal windows and execute this command:
VBoxManage setextradata [vmname] VBoxInternal/CPUM/CMPXCHG16B 1
where [vmname] is your Windows 8.1 virtual machine name.

Here is my screenshot: Install Visual Studio 2013 Preview on Windows 8.1 Preview

Update on July 10: You need to the Oracle VirtualBox 4.2.16 or later to install VirtualBox Addition in order to make the full screen, shared folder and other features.

Reinstall Guest Additions on Ubuntu Virtual Machine

Each time Ubuntu virtual machine running on Apple Mac OS/X host machine upgraded to new kernel or major upgrade, Oracle VM VirtualBox Guest Additions need to re-install. Also, it need to upgrade when Oracle VM VirtualBox upgrade to new version.

Windows 8 Preview on VirtualBox

Microsoft Windows 8 Consumer Preview or Enterprise Preview will run perfectly on VirtualBox virtual machine. However, after I installed VirtualBox Guest Additions, Microsoft Windows 8 Preview did not run correctly. I could not open my email client or desktop. So, I wiped out the virtual machine and start over without install Guest Addition.

How to mount a VirtualBox shared folder in Ubuntu guest

1. Click on VirtualBox VM Devices and Shared Folders... to create a shared folder, named it SharedFolder, for example.
2. On Ubuntu guest machine, open Terminal
3. Type sudo mkdir /mount/vboxshared
4. Type sudo mount -t vboxsf SharedFolder /media/vboxshared to mount the VirtualBox shared folder as read. To make it read/write, use this command: sudo mount -t vboxsf -o uid=1000,gid=1000 SharedFolder /media/vboxshared

If the shared folder is a permanent share and auto mount, make sure your user id in group vboxsf. To add a user id to group vboxsf, using command: sudo usermod -a -G vboxsf linuxuserid

Reference:

https://help.ubuntu.com/community/VirtualBox/SharedFolders
https://forums.virtualbox.org/viewtopic.php?t=3201&highlight=share+folder

How to upgrade VirtualBox 4.0.12 to 4.1.4 on Ubuntu 11.04

Oracle released VirtualBox 4.1.4, a maintenance release of VirtualBox 4.1 which improves stability and fixes regressions, on Oct 3rd, 2011. Using 'sudo apt-get update' and 'sudo apt-get upgrade' will not upgrade your Oracle VirtualBox (https://www.virtualbox.org/) from 4.0.12 to 4.14. To upgrade:

1. Backup your virtual machine by press <ctrl>-E to export appliance
2. Go to Ubuntu Software Center to uninstall current version
3. Install new version Oracle VM VirtualBox 4.1.4
4. Install Oracle VM VirtualBox Extension Pack
5. Run virtual machine and apply new version of Oracle VM VirtualBox Guest Addition 4.1.4r74291