Configuring an Ubuntu server under Microsoft Hyper-V

It's fairly straightforward to make this happen. Do a basic config of the system and then:

$ sudo vi /etc/initramfs-tools/modules
    & add below lines
hv_vmbus
hv_storvsc
hv_blkvsc
hv_netvsc

Save the file, then: 

$ sudo update-initramfs –u

$ sudo reboot

$ sudo ifconfig -a

$sudo vi /etc/network/interfaces
    Add below lines for dhcp:
    Auto eth0
iface eth0 inet dhcp

    Add below lines for static IP:
auto eth0
iface eth0 inet static
address 10.0.0.100 [IP address]
netmask 255.255.255.0 [Subnet]
gateway 10.0.0.1 [Default Gateway]

Now restart networking service & reboot:

$ sudo /etc/init.d/networking restart
$ sudo reboot

And you will be good to go!