1. Set up shared folders
Click the "Devices" -> Shared Folders menu to add a shared folder. The options Fixed and Temporary refer to whether the folder is persistent or not. You can choose any shared name you like, such as "hadoop", try to use the English name.
2. Mount the shared folder
Re-enter the virtual Ubuntu and enter in the command line terminal:
sudo mkdir /mnt/share
sudo mount -t vboxsf hadoop /mnt/share
where "hadoop" is the name of the shared folder created earlier. OK, now Ubuntu and the host can transfer files to each other.
3. To uninstall use the following command:
sudo umount -f /mnt/share
Notice:
The name of the shared folder must not be the same as the name of the mount point. For example, the above mount point is /mnt/share, if the name of the shared folder is also share, the following error message will appear during the mount (see http://www.virtualbox.org/ticket/2265 ):
/sbin/mount.vboxsf: mounting failed with the error: Protocol error
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