Fix VirtualBox Shared Folder Is Locked / Unable to Open in Ubuntu 21.04

Virtualbox

Running Ubuntu as virtual machine via VirtualBox? You may encounter permission issue to access the shared folder between host and guest.

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Shared Folders is an useful feature for file sync between Virtualbox host and guest OSes. However, after you created one, the shared folder is marked with cross and lock icons. And it pops up an error dialog when you trying to open it:

Unhandled error message:
GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Unix process subject does not have uid set.

vbox share locked 600x295 1

Or it prompts permission issue while accessing from the left pane in file manager:

You do not have permissions necessary to view the contents of “xxx”

vbox share notaccess 600x301 1

Fix shared folder permission issue:

The shared folder belongs to vboxsf group in the guest. All you need to do is add your user into this group.

There are a few ways to add an user to a group. Here I’m going to do it via a single command:

  1. Firstly, start the virtual machine and login.
  2. Open a terminal window from system app launcher.
  3. When terminal opens, run command to check your username in case you don’t remember:
    whoami
  4. Finally add user to vboxsf group (replace USER_NAME with what printed in last command.):
    sudo adduser USER_NAME vboxsf

add user tovboxsf 600x220 1

Restart VM to apply change and enjoy!

Original Article

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