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).

Shared folders refer to a feature that allows file sharing between the host operating system (the main system running the virtualization software) and the guest operating system (the system running inside the virtual machine).

How to permanently mount the shared folder

Create a mount point (shared folder)

sudo mkdir /mnt/shared

Edit /etc/fstab

Open the /etc/fstab file in a text editor with root privileges.

sudo nano /etc/fstab

Add a Line for the Shared Folder

Add a new line at the end of the file with the following format (use a Tab key as the separator):

<shared_folder>    /mnt/shared    vboxsf    defaults    0    0

Replace <shared_folder> with the name of your VirtualBox shared folder, and /mnt/shared with the path to your chosen mount point.

Example

shared    /mnt/shared    vboxsf    defaults    0    0

Save the changes and close the text editor.
Use the following command to mount the shared folder immediately without restarting.

sudo mount -a

If the previous solution doesn’t work, try to use this.

Open the /etc/fstab file in a text editor with root privileges.

sudo nano /etc/fstab

Change the line for the Shared Folder to:

<shared_folder>  /mnt/shared  vboxsf  defaults,_netdev,x-systemd.automount  0  0

Example

shared  /mnt/shared  vboxsf  defaults,_netdev,x-systemd.automount  0  0