Ubuntu – Cannot install guest additions in Ubuntu 13.04 on VBox 4.2.12

In order to use shared folder functionality few prerequisites need to be met:

• Make sure that Guest Additions are properly installed on the guest OS.
• Users in a guest Ubuntu must be in the group vboxsf to be able to access shares.
• Define a directory on the host that will be used in the virtual machine using the settings dialogue of Virtual Box.

Depending on host or guest OS the following may also be needed:

• Do not share personal folders like /home/username or My Documents
• Avoid special characters or empty spaces in the path to the shared folder, especially if the host or VM is a Windows machine
• Use different names for share and mountpoint
• Create a mountpoint on the guest OS (best in your HOME directory).

Testing shared folders functionality can be done by creating a shared directory on the host (e.g. C:\myshare), define this as a shared folder for your guest system in Virtual Box settings (e.g. share), create a mount point in your guest os (e.g. mkdir /home/username/host) and mount this in the guest OS with the command:

sudo mount -t vboxsf -o uid=1000,gid=1000 share /home/username/host

where the option -o makes sure that you will have access to the mount (that will otherwise be owned by root).

For further information on shared folders see also the Virtual Box User Manual.

Files or directories can also be shared over the network by using Samba on the host and the guest.

I was able to resolve the mounting issue by the reinstalling the linux image:

sudo apt-get install --reinstall linux-image-$(uname -r)

BTW, it all started with upgrading VirtualBox. Bidirectional clipboard stopped working so I tried to reinsert Guest Additions ISO. This caused above stuff. Now, Guest Additions are mounted back, but clipboard wtill doesn't work...