You may have setup VirtualBox shared folder as we had previous described but you cannot use it or copy files to it until you mount VirtualBox shared folder on Ubuntu or Linux guest OS. Setting up a shared VBox folder allows you to easily share files between host OS and guest OS. This post shows how to mount VBox shared folder on Ubuntu guest. This method works on almost all Linux distributions.
The steps for mounting VBox shared folders is different for Windows and Ubuntu / Debian. Windows guide for mapping VBox shared folder will be published next. This guide only shows how to mount VirtualBox shared folder on Ubuntu and other Linux guest OSes. Host OS on which Oracle VirtualBox VM is installed can be anything.
Mounting VirtualBox shared folders is easy on Linux guest OSes. If you enabled Auto-mount while creating shared folder then it should automatically be mounted to /media/USER/sf_ShareName or /media/sf_ShareName, depending on your guest OS.
Virtualbox Shared Folder Auto-Mount
In the example shared folder shown in the picture above, Folder Name is also known as ShareName. Its mount point will be: /media/htpcbeginner/sf_Share or /media/sf_Share, depending on the guest OS. Username htpcbeginner will be different in your case. Navigate to these folders to access the files.
VitualBox Shared Folder Permissions
You may encounter permissions issues when trying to access VirtualBox shared folder on Ubuntu (or other Linux distros). The shared folder is mounted with 770 permissions with root user and vboxsf as the group. Therefore, you need to enable root (administrator privileges) to access the shared files. But this can be inconvenient and you may want to the current user (you) to be able to access the files without having to enable root or opening your file explorer with root privileges.
To mount VirtualBox shared folder on Ubuntu and access everything within the shared folder as the user, in this example htpcbeginner, you will have to manually add the user to vboxsf group using the following command:
sudo usermod -a -G vboxsf USER
Of course, replace USER with your username. Once done, the user will have read/write access to the VBox shared folder. For easy access / convenience, you may create a symbolic link to the mounted shared folder in your home folder:
Note that /media/htpcbeginner/sf_Share could be /media/sf_Share depending on how your Linux OS mounts VBox shared folder. Also, replace htpcbeginner with your username. Once done, you will have a symbolic link created to the Vbox VM shared folder in your home directory as shown below.
Symlinked Vbox Shared Folder In Xubuntu
Manually Mount VBox Shared Folder on Ubuntu
Now what if, you did not automount the shared folder? You may go to Device->Shared Folder Settings, edit the shared folder, and enable Auto-mount. You may also check "Make Permanent" if you want the mounting to stick on reboot. Alternatively, you may manually mount VirtualBox shared folder on Ubuntu or Linux, anytime, using the following command:
sudo mount -t vboxsf -o uid=$UID,gid=$(id -g) ShareName NewFolder
Replace ShareName with Folder Name from the first picture and NewFolder with desired folder name (could be same as ShareName). Using this command to mount VirtualBox shared folder on Ubuntu / Debian will automatically enable read/write permissions for the current user. These mounting instructions work on all Linux distributions.
Using fstab to auto-mount VirtualBox shared folders during boot does not work in recent versions of Ubuntu as VirtualBox services start after the filesystem is mounted. You may encounter "no such device" error as OS cannot find the shared folder to mount. The OS may stop booting. Hence, enabling Auto-mount in the Shared Folder Settings and adding the user to vboxsf group is the way to setup automount during boot with required permissions. So there you go, mount VBox shared folder on Ubuntu or other Linux guest OSes, and enjoy seamlessly sharing files between the two OSes.
Complete Guide to Setting Up a Home Server on VirtualBox Virtual Machine:
Anand is a self-learned computer enthusiast, hopeless tinkerer (if it ain't broke, fix it), a part-time blogger, and a Scientist during the day. He has been blogging since 2010 on Linux, Ubuntu, Home/Media/File Servers, Smart Home Automation, and related HOW-TOs.
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