Ubuntu: Can't connect to host's internet connection using NAT

Question

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

Solution

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