Public bug reported:

I have a modified Ubuntu netboot image that uses dash instead of BusyBox
sh as /bin/sh in the initrd.

Starting with Ubuntu 16.04 Xenial, netcfg fails to automatically
configure the network interface during netboot in my configuration.
Instead I will be presented with a menu pop-up where I have to manually
select the network interface before the netboot can continue.

Since having dash as /bin/sh in the netboot initrd worked previously in
Ubuntu 15.10, I was able to bisect this issue to this upstream dash
commit between 0.5.7 and 0.5.8
(http://git.kernel.org/cgit/utils/dash/dash.git/commit/?id=46d3c1a614f11f0d40a7e73376359618ff07abcd).
However, since netcfg doesn't work with bash either, this could be a
netcfg bug that just happens to work with BusyBox sh.

I can reproduce this issue with the latest Ubuntu 16.10 Yakkety netboot
installer as well.

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

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https://bugs.launchpad.net/bugs/1617484

Title:
  netcfg does not configure network with dash or bash as /bin/sh

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