Comment 95 for bug 543506

I found that the problem of runlevel Unknown refers to a problem with /etc/network/interfaces look and if you can't find this file you maybe need to install it using "aptitude --install ifupdown_0.6.8ubuntu29_amd64.deb" to force to rewrite and create mising files download from http://packages.ubuntu.com/es/lucid/amd64/ifupdown/download
this file define eth0 and lo interfaces.
excuse for my english.