I looked at this question, but it didn't help.
I'm running Windows 7 as a host with Ubuntu 10.10 as a guest with VBox 4.0. I want to have a shared directory between the two. I have installed Guest Additions.
I went to the VBox control panel in Windows, added a Shared Folder (sharename Shared_Folder), and chose "Auto Mount". A directory named "sf_Shared_Folder" appeared in /media on Ubuntu, but when I put files in that directory from an OS, I can't see them on the other one.
I then tried to create a directory without automounting (sharename collectivefiles), and to run the following command:
foo@foo-VirtualBox:~$ sudo mount -t vboxsf collectivefiles FileShare /sbin/mount.vboxsf: mounting failed with the error: No such device
What is causing this error? I rebooted both the VM and VBox itself, but I'm still observing this.