Mount failed (unknown file system) in virtualbox in ubuntu 14.04 and Windows 7 as host after installing GuestAdditions

Question

I am using virtual box 4.3.6 in Windows 7 PC. I am trying to run Ubuntu 14.04 . After installing ubuntu since the display was low resolution i tried to install VirtualboxGuestAdditions I downloaded VBoxGuestAdditions_4.3.10.iso and followed steps in question mount gives unknown filesystem type 'vboxsf'

Now I got optimum resolution but i am unable to mount the shared folder.

I used the command .

mount -t vboxsf sharedFolderName DestinationFolder

Now i am getting the error wrong fs type .. I tried checking error using command

dmesg

and got

sf_read_super_aux err = -22

What I have done wrong ?? I have used the same method in fedora virtual image but with different VBoxGuestAddition version.

Answer 1

After searching web a lot i got some info regrading this from VirtualBox.org itself. In this new version of Guest Additions it has missed a symlink while installation. This breaks the path of /sbin/mount.vboxsf so that the mount command fails.

Using this command i was able to fix the bug.

sudo ln -s /opt/VBoxGuestAdditions-4.3.10/lib/VBoxGuestAdditions /usr/lib/VBoxGuestAdditions

Answer 2

I've fixed mine using the following way:

1) Update system's packages

$ sudo apt-get update

2) install virtual box guest additions (referenced from here)

$ sudo apt-get install virtualbox-guest-additions-iso

3) Now install guest additional package (Crucial step! People generally miss this which creates an error “Unknown file type “vboxsf”)

$ apt-get install virtualbox-guest-utils

NOTES:

You might face the following problems:

• No such device:

  root@packer-virtualbox-iso:~/new# mount -t vboxsf new ~/new

  /sbin/mount.vboxsf: mounting failed with the error: No such device

-> YOU HAVE TO RESTART TO ALLOW CHANGES TO TAKE EFFECT.

• you might experience the following error:

  vagrant@packer-virtualbox-iso:~$ sudo mount -t vboxsf new ~/new

  /sbin/mount.vboxsf: mounting failed with the error: Protocol error

-> TO RESOLVE THIS, YOU MIGHT HAVE TO CHANGE THE NAME OF THE MOUNTING DEVICE/FOLDER (e.g. here is new)

-> OR FOLLOW THIS if NOT FIXED (REF)

1. Made shared folder on host system, D:\Virtual Box\shared;
2. Ran VirtualBox;
3. Ran virtual machine;
4. Linux finished booting, I logged in;
5. I added shared folder D:\Virtual Box\shared, named it “shared”;
6. I made guest shared folder being logged as a user, called it “shared_folder”. /home//shared_folder;
7. $su;
8. Being logged as a root I mounted the shared folder: #mount -t vboxsf shared /home//shared_folder;
9. And all began to work.

May be the problem was host and guest folders should be the same names?

Answer 3

$ apt-get install virtualbox-guest-utils

did not work (permission denied). Instead use:

$ sudo apt-get install virtualbox-guest-utils

This worked fine with Virtual box 6.2 and Ubuntu 18.04.2.

Answer 4

How to make folder sharing from the start for working Ubuntu guest OS:

As of now (version 6.0.10 of VirtualBox) there are make permanent and auto-mount options for shared folder, also mount point (At) in GUI of virtualbox. For me the following worked:

1. On guest Ubuntu: sudo apt-get install virtualbox-guest-utils
2. Add shared folder in GUI of VirtualBox.
3. Restart guest OS

Folder on mount point specified in GUI was created automatically and ls showed files located on host Windows PC.

Answer 5

you don't mount the .is this way.

1. open virtual box main screen.
2. select your machine.
3. choose 'settings'.
4. select the 'storage' item.
5. one of the controllers should have a "disc" options, meaning DVD\CD drive, if not you can add one using the disc icon once selecting the controller (the one with the '+').
6. once you have one you can change the .iso file it's using in the 'attributes' section on the right.