Public bug reported:

i have a server (Proliant DL380 gen9). it has 4 Ethernet ports eno1 thru eno4. 
i am using ubuntu 17.10 and KVM with 4 multiple guest VMs. 
under Ubuntu 17.04 i had this in my /etc/network/interfaces:


   auto virbr0
   iface virbr0 inet dhcp
   bridge_ports eno1
   bridge_stp off
   bridge_fd 0
   bridge_maxwait 0   

So i did not define eno2 thru eno4 and everything worked fine.

After i upgraded to Ubuntu 17.10, i suddenly started having IP conflict from 
the DHCP server. 
after a lot of search, i figured my problem may be from the eno2-4 are getting 
IP even though they are dedicated to VMs.

so i defined them as manual in /etc/network/interfaces as such:
# Ethernet port for cad-srvr VM
auto eno2
iface eno2 inet manual
up ifconfig eno2 up

# Ethernet port for nxtcld-srvr VM
auto eno3
iface eno3 inet manual
up ifconfig eno3 up

# Ethernet port for Future-srvr VM
auto eno4
iface eno4 inet manual
up ifconfig eno4 up


This caused the DHCP warnings of conflicted IP to disappear.

I am not sure if this is per design or not... 
please advice me if i need to provide any other info

** Affects: apparmor (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1741331

Title:
  Ethernet interface aquire IP even if not defined in
  /etc/network/interfaces

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