The Hardy netboot issues can be debugged by booting with break=mount debug=y,
then running 
t=/dev/tty2; sh <$t >$t 2>$t &  # repeat for tty3 if you want
exit

 boot will continue, and hang because the network is down.  You can
debug by switching to another console and looking at /casper.log (where
stdout and stderr are redirected).

Some script tries to switch to manual mode when nfsroot booting, so ifup
doesn't screw it up later.  I guess if you don't put ip=something (other
than dhcp) on the commandline, Hardy won't nfsroot boot.

 This is not the NetworkManager issue, and is not present in Intrepid.
I only mention it because Hardy is an LTS release, so it people may be
trying to mess around with it on servers for a while...

 Hmm, Hardy might be failing because it tries to use eth0, while the
network cable is plugged in to eth1, according to its detection order.
(I haven't tried netbooting Hardy at home, only on a Dell PE1950 with
dual bnx2 NICs.)  Intrepid detects the ports in the opposite order, with
eth0 as the port marked GbE 1 (of 2) on the back, and which has the
lower MAC address.  I plugged my cables into GbE 1 since the BIOS
defaults to netbooting from that interface, but not the other one, among
other reasons.  So anyway, maybe it's just Hardy's bad luck, and
Intrepid would have the same problem if it needed to use eth1.

-- 
live cd from nfsroot breaks the nfs mount during bootup
https://bugs.launchpad.net/bugs/268005
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