Public bug reported:

When trying to preseed an Ubuntu Server 16.04.4 LTS installation I have run in 
into a problem:
I have two ethernet interfaces, and configured a bond0 interface with a bond0.1 
vlan interface. 

But I've noticed when the installer gets to the netcfg part
(v1.135ubuntu4.5) it first flushes all network interfaces, than brings
all interfaces down, and then brings up only one interface that was
chosen from the GUI installation  (all four interfaces were available,
and I chose bond0.1, it will likely behave the same way when trying to
automate it all using a BOOTIF=bond0.1 entry).

Having only one interface up is not very good, since bond0.1 needs bond0
and at least one hw interface up to work properly.

This results in the installer not being able to get the address from
DHCP, if I intervene after the error, manually bring up all the
interfaces, and then retry network auto-configuration it gets the
address from DHCP and I can continue installing as usual.

I believe it would be possible to fix this behaviour if netcfg would
check if the chosen interface is a bond* and then it would bring all
other bond interfaces and slaves (or at lease all the hw interfaces that
have a link) up.

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


** Tags: bonding installation installer netcfg

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https://bugs.launchpad.net/bugs/1805636

Title:
  netcfg doesn't work correctly with bond interfaces during ubuntu
  server installation

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