Can’t Open “Shared Folders” Ubuntu Virtual Box

For example, you have to set “shared folders” in Virtual Box and name your share folder with “d_folder”. When you open your shared folder in Ubuntu, it must error like below :

“The folder contents could not be displayed.
You do not have the permissions necessary to view the contents of “d_folder”. “

To solve it, do the steps below :

1. Open terminal

2. Write code below and then press Enter on your keyboard

sudo adduser xxxxx vboxsf

3. Logout then login again into ubuntu