virtualbox.org

Hello, at home I have a server and in that I have a Ubuntu Server VM. How can I access that VM from anywhere? (Even on my localhost its not working)

You must have a network in your VM to allow access outside the VM. Depending on the network type and where 'anywhere' is, you may have to open ports in various port-forwarding settings and firewalls.

See Virtualbox Networks: In Pictures

Let's see what network your VM has now: Right-click the VM in the main Virtualbox window's VM list, choose Show in Explorer/Finder/File Manager. Zip the VM's .vbox file (not the .vbox-prev file), and post the zip file, using the forum's Upload Attachment tab. (Configure your host OS to show all extensions if the folder that opens does not show a .vbox file.)

Also, please define the extents of 'anywhere': the host computer? other computers in your physical network? computers on the internet?