------- Comment From [email protected] 2016-08-24 12:34 EDT-------
Thanks very much vorlon and pitti. Pretty nice findings!

But...the issue still persists. I'll summarize the tests I made:

1) Firstly, I changed the link /usr/bin/readlink and, as vorlon
predicted, this didn't solve the issue.

2) Then, independently of (1), I applied pitti's patch to xenial's "73
-usb-net-by-mac.rules" and...unfortunately it also didn't solve the
issue.

What impress me more is the difficult/interference of the simplest debug
on the issue! After testing pitti's patch, still with the patch applied,
I changed the start-udev load like this:

(before)
SYSTEMD_LOG_LEVEL=notice /lib/systemd/systemd-udevd --daemon 
--resolve-names=never
(after my change)
SYSTEMD_LOG_LEVEL=debug /lib/systemd/systemd-udevd --daemon 
--resolve-names=never --debug

Well, the issue reproduced and I didn't see a single extra log message.

After this, I kept both pitti's patch and this systemd debug parameter,
but I booted with command-line "BOOT_DEBUG=1". Guess what? I was flooded
by messages but the installer showed up. This is really weird for
me...I'll attach a screen session of this last trial.

I appreciate any suggestion you have to debug the issue further - by the
way, using "net.ifnames=1" workarounds the issue too. Basically, any
command-line option seems to solve it, even the simplest debug
parameter.

Thanks very much for the help and advice,

Guilherme

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https://bugs.launchpad.net/bugs/1615021

Title:
  Unable to network boot Ubuntu 16.04 installer normally on Briggs

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