Networking problems on Ubuntu guest after upgrade VirtualBox from 4 to 5

Question

• Host is Windows 7
• Guest is Ubuntu 12.04

Everything was working fine before the VirtualBox upgrade.

Now, on boot, that ubuntu instance keeps waiting for network and when it finally boots ifconfig only shows the lo interface.

The strange thing is that another instance, ubuntu 14.04, with the same configuration, keeps working as normal.

/etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

auto eth1
iface eth1 inet static
 address  10.90.90.4
 network  10.90.90.0
 broadcast 10.90.90.255
 netmask 255.255.255.0
 metric 1

ifconfig output:

ifconfig -a output:

VirtualBox network config: (host only network):

Instance network config (eth0, bridged):

Instance network config (eth1, host only):

Any help?

== EDIT ==

Forgot to mention that eth0 and eth1 did show up on ifconfig after the upgrade, though they had not the RUNNING flag, and stopped showing after i regenerated the mac address in the vbox configuration window.

Answer 1

I think that regenerating the MAC Address of the NICs have now changed the interface name, edit this file "/etc/udev/rules.d/70-persistent-net.rules" you should see the eth0 and eth1, adjust here the MAC Address with the new generated by Virtual BOX. Probably there is also eth5 and eth6, remove them from the file.