Comment 9 for bug 114457

I solved this problem!
The reason is that networking subsystem does not start at boot. I don't know why Canonical decided to do that)) You can add /etc/init.d/networking manually or by this command

# update-rc.d networking defaults

(i do this by sysv-rc-conf program (you can check by this program if networking script is started), but it must be installed manually by apt-get install)