Ubuntu not recognized by Win7 network manager

Question

Until yesterday I've been successfully connecting Ubuntu 15.04 to WIN7 through ethernet;

Win7 was sharing internet and Ubuntu has a shared-folder you could access through Win7.

But now it isn't working anymore,
From the Network manager on windows I can see that the ethernet connection is unidentified but I can't seem to troubleshoot in any way;

Ubuntu network manager auto-ethernet option blinks but no connection is established.

I've tried configuring Samba workgroup and creating a home group on win 7 but without any success;

edit:

if I connect through wifi network directly to router (tplink 4g router) the shared folder on ubuntu is accessible from Win (I must be something related to eth connection)

Answer 1

The problem is solved with the folowing steps:

1. Stop Network Manager /etc/init.d/NetworkManager stop
2. Remove the Service from Run Levels update-rc.d -f NetworkManager remove
3. Edit your interfaces file vi /etc/network/interfaces

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When you are editting the network interface you can set you inteface as

Interface with DHCP

auto eth0
iface eth0 inet dhcp

or as Static Interface

auto eth0
iface eth0 inet static
  address x.x.x.x
  gateway x.x.x.y
  netmask x.x.x.x
  network x.x.x.z
  broadcast x.x.x.n

and save vi /etc/network/interfaces then do the following command:

/etc/init.d/networking restart

if you set a static addressing you must to be sure you have set DNS.

edit the following file vi /etc/resolv.conf

search example.com
domain example.com
nameserver 8.8.4.4

set your desired DNS server and save.

and there you have your network interface working again.

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Aditional Resources. Here