Marcus Thornton Marcus Thornton - 27 days ago 4x
Linux Question

Cannot access the shared folder in Virtual Box

I have problem with accessing the shared folder.

My host OS is Windows 7 Enterprise Edition SP1, and the guest OS is Ubuntu Linux 10.04 Desktop Version. I'm using Virtual Box 4.2.10, and I have installed VBox guest add-on and Oracle VM VirtualBox Extension Pack.

When I put commend:
mat@mat-desktop:~$ cd /media/sf_MAT/
bash: cd: /media/sf_MAT/: Permission denied

again with sudo:
sudo cd /media/sf_MAT/
sudo: cd: command not found

What could be the solution?


The issue is that your user "mat" is not in the same group as "vboxsf". This group "vboxsf" is the group which has read/write permissions to that folder. Also the root has permission to that folder because its in the group "vboxsf".

What you need is to add your user "mat" to the same group. Start your terminal and write the following line:

sudo usermod -aG vboxsf mat
  • sudo - because you need root permission
  • usermod - the command to change the user properties
  • -a means append to the group
  • -G means you will supply the group name now
  • vboxsf is the group name that you want your user to be in
  • mat is your username

A reboot, or a logout, may be required for changes to take affect.

After this operation you can verify that your user is indeed in the vboxsf group by doing this:

cat /etc/group | grep "vboxsf"

you will see your username there. Now you shall be able to access that folder. If any issue, just comment here and I will tell you alternative methods.

Also, if all of this sounds too geeky, you can do the same thing using the graphical tools. One guide is here

Also, in new virtual box - 4.3.20 I guess, they have this new feature of drag and drop where you can just drag files and folders to your virtual machine just by dragging. Isn't that nice. :)