Internet isn't working on Ubuntu 14.04 running as VirtualBox guest OS

Question

I have installed Ubuntu 14.04 Trusty Tahr as guest OS on VirtualBox running on Windows 8, but Internet isn't working on the my guest OS.

What is the problem?

Solution 1

This is how I fixed it.

• On Windows 8, go to Network and Sharing Center → Virtual Host-Only Network → Properties and tick the VirtualBox Bridged Networking Driver option. Then click on the Ok button.

• On VirtualBox, go to the Devices menu → Network → Network Settings.... In the Adapter 1 tab, select NAT from the Attached to drop-down menu.

That's it. Internet is working perfectly now on my guest OS.

Solution 2

I have enabled it from Devices → Network → Connect Network Adapter.

Solution 3

I had the same issue too, even if I was using a more recent version of VirtualBox (5.2.16 r123759) on Windows 10 (Version 1803, OS Build 17134.165). I was using Bridged Adapter, and it worked fine for at least a week; then the guest OS was not able to connect to Internet anymore.

I tried changing the DNS on the guest OS; restarting the guest OS; shutting down the guest OS, closing VirtualBox, re-opening it, and restarting the guest OS; restarting the host OS. Nothing worked. I checked if Cable connected was still selected, and it was.
Then I found Oracle VM VirtualBox: Networking options and how-to manage them, which explains how to get access to Internet from the guest OS, and make a server running on the guest OS available to the local network without using Bridged Adapter as network type.

I set the following values:

• Attached to: NAT
• Adapter Type: PCnet-FAST III (am79C973)
• Promiscuous Mode: Allow VMs
• MAC Address: I left the value shown from the dialog

I found an article saying to copy the MAC of the connection used from the host, but I tried that, and it didn't work. Leaving the MAC shown, or letting VirtualBox generate one, seems the only way to work it.

If I need to make a server running on the guest OS be visible on my LAN, I click on Port Forwarding and add a row with Host Port and Guest Port.