VirtualBox is a powerful open-source virtualization software developed by Oracle Corporation. It allows users to run multiple operating systems (OS) on a single physical machine, simultaneously. This is done by creating virtual environments known as virtual machines (VMs).

Reproducing the issue

Open Files and click on the <sf_shared_folder_name>.

Solution

To access the folder, add your user account to the vboxsf group.

sudo usermod -aG vboxsf $USER

Replace $USER with your actual username if necessary. In most cases, $USER should work just fine, and you don’t need to replace it. You do not need to replace it manually, as it will be replaced with your actual username when the command is executed.

Confirm that your user has been added to the group.

groups

Look for vboxsf in the list of groups. If it is not present, you may need to log out and back in, or reboot your system for the change to take effect.