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I configured aufs as a Root File System On Usb Flash Drive by this article. So the first brunch is real root FS and it is read-only. The second brunch FS is in memory and it is read-write capable. Both brunches combined in one file-based Copy-On-Write union and mounted at / .

All things seams working well, but network interface. While the Ubuntu 11.10 Oneric 3.0.0-16-server x86_64 booting I see next message: Waiting network configuration

After it boots eth0 don't bring UP:

rootubuntu:~# ifconfig
lo Link encap:Local Loopback
met addr:127.O.O.1 Mask:255.O.O.0
inet6 addr: ::1/128 Scope:Host
RX packets:0 errors:O dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:O overruns:O carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 6) TX bytes:0 (0.0 6)

restarting networking not helping:

root@ubuntu:~# /etc/init.d/networking restart
* Running /etc/init.d/networking restart is deprecated because it may not enabie again some interfaces
* Reconfiguring network interfaces...
dhclient3: error while loading shared libraries: cannot open shared object file: No such file or directory
Failed to bring up ethO.

The library remains the same place at /lib/x86_64-linux-gnu/ and link /lib/x86_64-linux-gnu/ for it. When I boot normally (without aufs as root FS ) all things go well again.

How to FIX it?

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up vote 2 down vote accepted

The answer is short: this is the problem with apparmor compatibility.

 apt-get install apparmor-utils
 aa-complain dhclient3

Seems like apparmor do not like how aufs working. In this case other problems can happen due to usage of aufs with apparmor.

There is another way to fix problem.

Or you will need to remove apparmor.

/etc/init.d/apparmor stop
update-rc.d -f apparmor remove
aptitude remove apparmor apparmor-utils
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