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I installed Lubuntu on Virtualbox. I'm using Windows 7 x64. My VM is 32 bit version. The internet works using Bridged Adapter, but I'm trying to use NAT so I can use a VPN. In Network and Sharing Center in Windows, I see connection "VirtualBox Host-Only Connection" and it says "No Internet Access". In properties, "VirtualBox Bridged Networking Driver" is checked. The following is the output of ifconfig:
dev@dev-VirtualBox:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:f3:48:24
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fef3:4824/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:379 errors:0 dropped:0 overruns:0 frame:0
TX packets:421 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:32105 (32.1 KB) TX bytes:34987 (34.9 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:856 errors:0 dropped:0 overruns:0 frame:0
TX packets:856 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:56432 (56.4 KB) TX bytes:56432 (56.4 KB)
Routing Table:
dev@dev-VirtualBox:~$ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 10.0.2.2 0.0.0.0 UG 0 0 0 eth0
10.0.2.0 * 255.255.255.0 U 1 0 0 eth0
dev@dev-VirtualBox:~$
Connection Editor: General: Automatically Connect to this network when it isn't available, All users may connect ot this network Ethernet: MTU automatic IPV4: Automatic (DHCP), Require ipv4 addressing for this connection to complete IPV6: Ignore
dev@dev-VirtualBox:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
799
Troubleshooting Steps Check that your wireless adapter is enabled and that Ubuntu recognizes it: see Device Recognition and Operation. Check if drivers are available for your wireless adapter; install them and check them: see Device Drivers. Check your connection to the Internet: see Wireless Connections.
Network Address Translation (NAT) Network Address Translation (NAT) is the simplest way of accessing an external network from a virtual machine. Usually, it does not require any configuration on the host network and guest system. For this reason, it is the default networking mode in Oracle VM VirtualBox.
Right-click the NetworkManager icon in the system tray and check Enable Networking. All network adapters will be reenabled. If it was successful the system can attach to the local network, and get an IP address as indicated by the NetworkManager applet. Your issue should be resolved.
It is very often observed that after installing Ubuntu 20.04 either on a Physical Server or on a virtual machine, if you try to connect Internet then it won't work. This usually happens when your network interface is not given properly due to which it is not able to fetch the IP from dhcp.
I have a VPN client in the LinuxMint host. My objective is to allow the Ubuntu guest to access server through the VPN connection. It was not easy, but after some reading, I decided the NAT adapter option is the most likely solution. Hence I did the following: Add new network adapter in VirtualBox settings for my Ubuntu guest (NAT)
For this we will use an Ubuntu VM as NAT router and another Ubuntu VM as client VM for the purpose of testing. To test the setup, we are using Virtualbox for creating and managing virtual machines (VMs). Two Ubuntu VMs with one having two network interfaces (NICs).
Network Connection in Ubuntu 20.04 is managed by the Netplan. So first you need to check the current settings of netplan from /etc/netplan/01-network-manager-all.yaml file. You can use utility like cat command to check the YAML configuration as shown below. Please note that here I am running all the commands with root user.
It turns out that NetworkManager was not updating /etc/resolv.conf with the nameservers.
Commenting out dns=dnsmasq in /etc/NetworkManager/NetworkManager.conf worked after rebooting.
From here (the first solution didn't work for me) https://askubuntu.com/questions/137037/networkmanager-not-populating-resolv-conf
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